| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| 0 | Less than 1 Year | 0 | 
                                    
                                    0%
                                 | 
| 1 | 2 | 
                                    
                                    6.1%
                                 | |
| 2 | 7 | 
                                    
                                    21.2%
                                 | |
| 3 | 6 | 
                                    
                                    18.2%
                                 | |
| 5 | 4 | 
                                    
                                    12.1%
                                 | |
| 10 | 3 | 
                                    
                                    9.1%
                                 | |
| 15 | 4 | 
                                    
                                    12.1%
                                 | |
| 18 | 1 | 
                                    
                                    3%
                                 | |
| 30 | 2 | 
                                    
                                    6.1%
                                 | |
| 34 | 1 | 
                                    
                                    3%
                                 | |
| 40 | 3 | 
                                    
                                    9.1%
                                 | |
| Sysmiss | 95 |