| Value | Category | 
                                    
                    
                        | -5 | other | 
                                    
                    
                        | -4 | missing data | 
                                    
                    
                        | -3 | refused to answer | 
                                    
                    
                        | -2 | not applicable | 
                                    
                    
                        | -1 | do not know | 
                                    
                    
                        | 0 |  | 
                                    
                    
                        | 4 |  | 
                                    
                    
                        | 4.5 |  | 
                                    
                    
                        | 5 |  | 
                                    
                    
                        | 7 |  | 
                                    
                    
                        | 8 |  | 
                                    
                    
                        | 10 |  | 
                                    
                    
                        | 12 |  | 
                                    
                    
                        | 14 |  | 
                                    
                    
                        | 14.3999996185303 |  | 
                                    
                    
                        | 15 |  | 
                                    
                    
                        | 16 |  | 
                                    
                    
                        | 18 |  | 
                                    
                    
                        | 20 |  | 
                                    
                    
                        | 22 |  | 
                                    
                    
                        | 25 |  | 
                                    
                    
                        | 30 |  | 
                                    
                    
                        | 35 |  | 
                                    
                    
                        | 40 |  | 
                                    
                    
                        | 48 |  | 
                                    
                    
                        | 50 |  | 
                                    
                    
                        | 55 |  | 
                                    
                    
                        | 60 |  | 
                                    
                    
                        | 66 |  | 
                                    
                    
                        | 70 |  | 
                                    
                    
                        | 80 |  | 
                                    
                    
                        | 84 |  | 
                                    
                    
                        | 90 |  | 
                                    
                    
                        | 96 |  | 
                                    
                    
                        | 100 |  | 
                                    
                    
                        | 105 |  | 
                                    
                    
                        | 108 |  | 
                                    
                    
                        | 110 |  | 
                                    
                    
                        | 114 |  | 
                                    
                    
                        | 120 |  | 
                                    
                    
                        | 130 |  | 
                                    
                    
                        | 132 |  | 
                                    
                    
                        | 140 |  | 
                                    
                    
                        | 144 |  | 
                                    
                    
                        | 150 |  | 
                                    
                    
                        | 156 |  | 
                                    
                    
                        | 160 |  | 
                                    
                    
                        | 170 |  | 
                                    
                    
                        | 175 |  | 
                                    
                    
                        | 180 |  | 
                                    
                    
                        | 200 |  | 
                                    
                    
                        | 204 |  | 
                                    
                    
                        | 210 |  | 
                                    
                    
                        | 216 |  | 
                                    
                    
                        | 230 |  | 
                                    
                    
                        | 240 |  | 
                                    
                    
                        | 250 |  | 
                                    
                    
                        | 252 |  | 
                                    
                    
                        | 260 |  | 
                                    
                    
                        | 264 |  | 
                                    
                    
                        | 276 |  | 
                                    
                    
                        | 280 |  | 
                                    
                    
                        | 288 |  | 
                                    
                    
                        | 300 |  | 
                                    
                    
                        | 325 |  | 
                                    
                    
                        | 350 |  | 
                                    
                    
                        | 354 |  | 
                                    
                    
                        | 360 |  | 
                                    
                    
                        | 384 |  | 
                                    
                    
                        | 385 |  | 
                                    
                    
                        | 400 |  | 
                                    
                    
                        | 420 |  | 
                                    
                    
                        | 432 |  | 
                                    
                    
                        | 456 |  | 
                                    
                    
                        | 480 |  | 
                                    
                    
                        | 500 |  | 
                                    
                    
                        | 504 |  | 
                                    
                    
                        | 528 |  | 
                                    
                    
                        | 600 |  | 
                                    
                    
                        | 672 |  | 
                                    
                    
                        | 700 |  | 
                                    
                    
                        | 720 |  | 
                                    
                    
                        | 750 |  | 
                                    
                    
                        | 800 |  | 
                                    
                    
                        | 828 |  | 
                                    
                    
                        | 840 |  | 
                                    
                    
                        | 900 |  | 
                                    
                    
                        | 920 |  | 
                                    
                    
                        | 960 |  | 
                                    
                    
                        | 1000 |  | 
                                    
                    
                        | 1020 |  | 
                                    
                    
                        | 1068 |  | 
                                    
                    
                        | 1200 |  | 
                                    
                    
                        | 1320 |  | 
                                    
                    
                        | 1440 |  | 
                                    
                    
                        | 1800 |  | 
                                    
                    
                        | 2400 |  | 
                                    
                    
                        | 4000 |  | 
                                    
                    
                        | 4500 |  | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.