| Value | Category | Cases | |
|---|---|---|---|
| 1961 | 7 |
0.7%
|
|
| 1969 | 3 |
0.3%
|
|
| 1971 | 5 |
0.5%
|
|
| 1973 | 2 |
0.2%
|
|
| 1974 | 2 |
0.2%
|
|
| 1975 | 3 |
0.3%
|
|
| 1977 | 9 |
0.9%
|
|
| 1978 | 3 |
0.3%
|
|
| 1979 | 8 |
0.8%
|
|
| 1980 | 30 |
3%
|
|
| 1981 | 5 |
0.5%
|
|
| 1982 | 33 |
3.3%
|
|
| 1983 | 33 |
3.3%
|
|
| 1984 | 32 |
3.2%
|
|
| 1985 | 14 |
1.4%
|
|
| 1986 | 6 |
0.6%
|
|
| 1987 | 5 |
0.5%
|
|
| 1988 | 45 |
4.5%
|
|
| 1989 | 29 |
2.9%
|
|
| 1990 | 25 |
2.5%
|
|
| 1991 | 2 |
0.2%
|
|
| 1992 | 9 |
0.9%
|
|
| 1993 | 9 |
0.9%
|
|
| 1994 | 3 |
0.3%
|
|
| 1996 | 4 |
0.4%
|
|
| 3333 | Missing | 673 |
67.4%
|