| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not yet introduced | 28 |
3.5%
|
| 1 | 29 |
3.6%
|
|
| 2 | 53 |
6.6%
|
|
| 3 | 81 |
10%
|
|
| 4 | 66 |
8.2%
|
|
| 5 | 74 |
9.2%
|
|
| 6 | 319 |
39.5%
|
|
| 7 | 46 |
5.7%
|
|
| 8 | 39 |
4.8%
|
|
| 9 | 14 |
1.7%
|
|
| 10 | 5 |
0.6%
|
|
| 11 | 2 |
0.2%
|
|
| 12 | 22 |
2.7%
|
|
| 14 | 1 |
0.1%
|
|
| 15 | 1 |
0.1%
|
|
| 18 | 1 |
0.1%
|
|
| 24 | 1 |
0.1%
|
|
| 25 | 1 |
0.1%
|
|
| 88 | Don't Know | 24 |
3%
|
| Sysmiss | 645 |