| Value | Category | Cases | |
|---|---|---|---|
| 1964 | 158 |
1.2%
|
|
| 1965 | 205 |
1.5%
|
|
| 1966 | 210 |
1.6%
|
|
| 1967 | 200 |
1.5%
|
|
| 1968 | 221 |
1.7%
|
|
| 1969 | 218 |
1.6%
|
|
| 1970 | 226 |
1.7%
|
|
| 1971 | 258 |
1.9%
|
|
| 1972 | 259 |
1.9%
|
|
| 1973 | 292 |
2.2%
|
|
| 1974 | 311 |
2.3%
|
|
| 1975 | 279 |
2.1%
|
|
| 1976 | 323 |
2.4%
|
|
| 1977 | 308 |
2.3%
|
|
| 1978 | 329 |
2.5%
|
|
| 1979 | 337 |
2.5%
|
|
| 1980 | 300 |
2.2%
|
|
| 1981 | 335 |
2.5%
|
|
| 1982 | 334 |
2.5%
|
|
| 1983 | 311 |
2.3%
|
|
| 1984 | 358 |
2.7%
|
|
| 1985 | 371 |
2.8%
|
|
| 1986 | 391 |
2.9%
|
|
| 1987 | 399 |
3%
|
|
| 1988 | 446 |
3.3%
|
|
| 1989 | 460 |
3.4%
|
|
| 1990 | 503 |
3.8%
|
|
| 1991 | 592 |
4.4%
|
|
| 1992 | 606 |
4.5%
|
|
| 1993 | 599 |
4.5%
|
|
| 1994 | 601 |
4.5%
|
|
| 1995 | 603 |
4.5%
|
|
| 1996 | 636 |
4.8%
|
|
| 1997 | 632 |
4.7%
|
|
| 1998 | 604 |
4.5%
|
|
| 1999 | 152 |
1.1%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|