| Value | Category | Cases | |
|---|---|---|---|
| 1968 | 3 |
0.1%
|
|
| 1969 | 78 |
1.8%
|
|
| 1970 | 71 |
1.7%
|
|
| 1971 | 70 |
1.7%
|
|
| 1972 | 94 |
2.2%
|
|
| 1973 | 71 |
1.7%
|
|
| 1974 | 79 |
1.9%
|
|
| 1975 | 83 |
2%
|
|
| 1976 | 100 |
2.4%
|
|
| 1977 | 70 |
1.7%
|
|
| 1978 | 93 |
2.2%
|
|
| 1979 | 115 |
2.7%
|
|
| 1980 | 91 |
2.1%
|
|
| 1981 | 106 |
2.5%
|
|
| 1982 | 135 |
3.2%
|
|
| 1983 | 120 |
2.8%
|
|
| 1984 | 132 |
3.1%
|
|
| 1985 | 122 |
2.9%
|
|
| 1986 | 150 |
3.5%
|
|
| 1987 | 111 |
2.6%
|
|
| 1988 | 132 |
3.1%
|
|
| 1989 | 144 |
3.4%
|
|
| 1990 | 135 |
3.2%
|
|
| 1991 | 152 |
3.6%
|
|
| 1992 | 144 |
3.4%
|
|
| 1993 | 157 |
3.7%
|
|
| 1994 | 143 |
3.4%
|
|
| 1995 | 165 |
3.9%
|
|
| 1996 | 146 |
3.4%
|
|
| 1997 | 161 |
3.8%
|
|
| 1998 | 163 |
3.8%
|
|
| 1999 | 120 |
2.8%
|
|
| 2000 | 152 |
3.6%
|
|
| 2001 | 98 |
2.3%
|
|
| 2002 | 122 |
2.9%
|
|
| 2003 | 119 |
2.8%
|
|
| 9997 | INCONSISTENT | 1 |
0%
|
| 9998 | DK | 2 |
0%
|
| Sysmiss | 85 |
2%
|