| Value | Category | Cases | |
|---|---|---|---|
| 1955 | 50 |
0.4%
|
|
| 1956 | 161 |
1.3%
|
|
| 1957 | 180 |
1.5%
|
|
| 1958 | 204 |
1.7%
|
|
| 1959 | 214 |
1.8%
|
|
| 1960 | 246 |
2%
|
|
| 1961 | 219 |
1.8%
|
|
| 1962 | 278 |
2.3%
|
|
| 1963 | 309 |
2.6%
|
|
| 1964 | 281 |
2.3%
|
|
| 1965 | 337 |
2.8%
|
|
| 1966 | 324 |
2.7%
|
|
| 1967 | 358 |
3%
|
|
| 1968 | 320 |
2.7%
|
|
| 1969 | 353 |
2.9%
|
|
| 1970 | 352 |
2.9%
|
|
| 1971 | 410 |
3.4%
|
|
| 1972 | 377 |
3.1%
|
|
| 1973 | 403 |
3.4%
|
|
| 1974 | 385 |
3.2%
|
|
| 1975 | 397 |
3.3%
|
|
| 1976 | 394 |
3.3%
|
|
| 1977 | 423 |
3.5%
|
|
| 1978 | 430 |
3.6%
|
|
| 1979 | 475 |
4%
|
|
| 1980 | 420 |
3.5%
|
|
| 1981 | 442 |
3.7%
|
|
| 1982 | 406 |
3.4%
|
|
| 1983 | 422 |
3.5%
|
|
| 1984 | 413 |
3.4%
|
|
| 1985 | 365 |
3%
|
|
| 1986 | 351 |
2.9%
|
|
| 1987 | 320 |
2.7%
|
|
| 1988 | 290 |
2.4%
|
|
| 1989 | 247 |
2.1%
|
|
| 1990 | 194 |
1.6%
|
|
| 1991 | 115 |
1%
|
|
| 1992 | 68 |
0.6%
|
|
| 1993 | 43 |
0.4%
|
|
| 1994 | 18 |
0.1%
|
|
| 1995 | 5 |
0%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 6 |
0%
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 317 |