| Value | Category | Cases | |
|---|---|---|---|
| -99 | DK | 2 |
0.1%
|
| -88 | Missing | 0 |
0%
|
| -77 | NA | 1406 |
90.5%
|
| 1960 | 1 |
0.1%
|
|
| 1961 | 1 |
0.1%
|
|
| 1967 | 1 |
0.1%
|
|
| 1971 | 2 |
0.1%
|
|
| 1972 | 4 |
0.3%
|
|
| 1977 | 2 |
0.1%
|
|
| 1980 | 4 |
0.3%
|
|
| 1981 | 2 |
0.1%
|
|
| 1982 | 4 |
0.3%
|
|
| 1983 | 3 |
0.2%
|
|
| 1984 | 1 |
0.1%
|
|
| 1985 | 1 |
0.1%
|
|
| 1986 | 1 |
0.1%
|
|
| 1988 | 3 |
0.2%
|
|
| 1989 | 4 |
0.3%
|
|
| 1990 | 5 |
0.3%
|
|
| 1991 | 3 |
0.2%
|
|
| 1992 | 5 |
0.3%
|
|
| 1993 | 1 |
0.1%
|
|
| 1994 | 1 |
0.1%
|
|
| 1995 | 9 |
0.6%
|
|
| 1996 | 17 |
1.1%
|
|
| 1997 | 17 |
1.1%
|
|
| 1998 | 17 |
1.1%
|
|
| 1999 | 15 |
1%
|
|
| 2000 | 15 |
1%
|
|
| 2001 | 6 |
0.4%
|
|
| Sysmiss | 24 |