| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 28 | 
                                    
                                    31.5%
                                 | 
| 300000 | 1 | 
                                    
                                    1.1%
                                 | |
| 250000000 | 2 | 
                                    
                                    2.2%
                                 | |
| 333000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 400000000 | 2 | 
                                    
                                    2.2%
                                 | |
| 500000000 | 2 | 
                                    
                                    2.2%
                                 | |
| 600000000 | 2 | 
                                    
                                    2.2%
                                 | |
| 700000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 800000000 | 3 | 
                                    
                                    3.4%
                                 | |
| 1000000000 | 3 | 
                                    
                                    3.4%
                                 | |
| 1800000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 2000000000 | 3 | 
                                    
                                    3.4%
                                 | |
| 2200000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 2500000000 | 2 | 
                                    
                                    2.2%
                                 | |
| 3000000000 | 4 | 
                                    
                                    4.5%
                                 | |
| 3300000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 3600000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 4000000000 | 2 | 
                                    
                                    2.2%
                                 | |
| 4500000000 | 2 | 
                                    
                                    2.2%
                                 | |
| 4700000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 5000000000 | 6 | 
                                    
                                    6.7%
                                 | |
| 6000000000 | 4 | 
                                    
                                    4.5%
                                 | |
| 6500000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 7000000000 | 2 | 
                                    
                                    2.2%
                                 | |
| 10000000000 | 2 | 
                                    
                                    2.2%
                                 | |
| 11000000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 12000000000 | 2 | 
                                    
                                    2.2%
                                 | |
| 13800000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 15000000000 | 2 | 
                                    
                                    2.2%
                                 | |
| 20000000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 32000000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 40000000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 43000000000 | 1 | 
                                    
                                    1.1%
                                 | |
| 48000000000 | 1 | 
                                    
                                    1.1%
                                 | |
| Sysmiss | 274 |