| Value | Category | 
                                    
                    
                        | -5 | other | 
                                    
                    
                        | -4 | missing data | 
                                    
                    
                        | -3 | refused to answer | 
                                    
                    
                        | -2 | not applicable | 
                                    
                    
                        | -1 | do not know | 
                                    
                    
                        | 1 | never | 
                                    
                    
                        | 2 | next term | 
                                    
                    
                        | 3 | next year | 
                                    
                    
                        | 4 | other/don't know | 
                                    
                    
                        | 2005 |  | 
                            
            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.