| Value | Category | Cases | |
|---|---|---|---|
| 1939 | 1 |
0.4%
|
|
| 1945 | 1 |
0.4%
|
|
| 1946 | 1 |
0.4%
|
|
| 1950 | 2 |
0.8%
|
|
| 1954 | 1 |
0.4%
|
|
| 1960 | 2 |
0.8%
|
|
| 1961 | 1 |
0.4%
|
|
| 1965 | 5 |
2%
|
|
| 1967 | 1 |
0.4%
|
|
| 1970 | 2 |
0.8%
|
|
| 1971 | 2 |
0.8%
|
|
| 1972 | 2 |
0.8%
|
|
| 1974 | 1 |
0.4%
|
|
| 1975 | 5 |
2%
|
|
| 1976 | 2 |
0.8%
|
|
| 1977 | 3 |
1.2%
|
|
| 1978 | 5 |
2%
|
|
| 1979 | 1 |
0.4%
|
|
| 1980 | 7 |
2.8%
|
|
| 1981 | 4 |
1.6%
|
|
| 1982 | 7 |
2.8%
|
|
| 1983 | 3 |
1.2%
|
|
| 1985 | 11 |
4.5%
|
|
| 1986 | 10 |
4%
|
|
| 1987 | 21 |
8.5%
|
|
| 1988 | 4 |
1.6%
|
|
| 1989 | 7 |
2.8%
|
|
| 1990 | 15 |
6.1%
|
|
| 1991 | 7 |
2.8%
|
|
| 1992 | 11 |
4.5%
|
|
| 1993 | 16 |
6.5%
|
|
| 1994 | 20 |
8.1%
|
|
| 1995 | 16 |
6.5%
|
|
| 1996 | 30 |
12.1%
|
|
| 1997 | 20 |
8.1%
|
|
| 9995 | 9995. Topcode | 0 |
0%
|
| 9996 | 9996. N/A | 0 |
0%
|
| 9997 | 9997. Refuse | 0 |
0%
|
| 9998 | 9998. DK | 0 |
0%
|
| 9999 | 9999. Miss | 0 |
0%
|
| Sysmiss | 1406 |