| Value | Category | Cases | |
|---|---|---|---|
| -3 | 12 |
0.2%
|
|
| 1973 | 67 |
0.9%
|
|
| 1978 | 76 |
1.1%
|
|
| 1982 | 249 |
3.5%
|
|
| 1983 | 278 |
3.9%
|
|
| 1984 | 154 |
2.2%
|
|
| 1985 | 217 |
3.1%
|
|
| 1986 | 1083 |
15.3%
|
|
| 1987 | 167 |
2.4%
|
|
| 1988 | 162 |
2.3%
|
|
| 1989 | 670 |
9.5%
|
|
| 1990 | 605 |
8.6%
|
|
| 1991 | 756 |
10.7%
|
|
| 1992 | 478 |
6.8%
|
|
| 1993 | 178 |
2.5%
|
|
| 1994 | 530 |
7.5%
|
|
| 1995 | 439 |
6.2%
|
|
| 1996 | 154 |
2.2%
|
|
| 1997 | 382 |
5.4%
|
|
| 1999 | 114 |
1.6%
|
|
| 2000 | 233 |
3.3%
|
|
| 3333 | Missing | 69 |
1%
|