| Value | Category | Cases | |
|---|---|---|---|
| 1961 | 9 |
0.2%
|
|
| 1962 | 36 |
0.7%
|
|
| 1963 | 26 |
0.5%
|
|
| 1964 | 18 |
0.3%
|
|
| 1965 | 64 |
1.2%
|
|
| 1966 | 82 |
1.5%
|
|
| 1967 | 27 |
0.5%
|
|
| 1968 | 37 |
0.7%
|
|
| 1969 | 48 |
0.9%
|
|
| 1970 | 199 |
3.6%
|
|
| 1971 | 215 |
3.9%
|
|
| 1972 | 106 |
1.9%
|
|
| 1973 | 95 |
1.7%
|
|
| 1974 | 83 |
1.5%
|
|
| 1975 | 190 |
3.5%
|
|
| 1976 | 171 |
3.1%
|
|
| 1977 | 66 |
1.2%
|
|
| 1978 | 98 |
1.8%
|
|
| 1979 | 79 |
1.4%
|
|
| 1980 | 200 |
3.6%
|
|
| 1981 | 301 |
5.5%
|
|
| 1982 | 152 |
2.8%
|
|
| 1983 | 186 |
3.4%
|
|
| 1984 | 143 |
2.6%
|
|
| 1985 | 243 |
4.4%
|
|
| 1986 | 262 |
4.8%
|
|
| 1987 | 153 |
2.8%
|
|
| 1988 | 176 |
3.2%
|
|
| 1989 | 157 |
2.9%
|
|
| 1990 | 237 |
4.3%
|
|
| 1991 | 259 |
4.7%
|
|
| 1992 | 234 |
4.3%
|
|
| 1993 | 259 |
4.7%
|
|
| 1994 | 236 |
4.3%
|
|
| 1995 | 256 |
4.7%
|
|
| 1996 | 93 |
1.7%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 224 |
4.1%
|
| 9999 | Missing | 72 |
1.3%
|
| Sysmiss | 347 |