| Value | Category | Cases | |
|---|---|---|---|
| 0 | was here | 834 |
87.1%
|
| 1970 | 3 |
0.3%
|
|
| 1971 | 1 |
0.1%
|
|
| 1974 | 1 |
0.1%
|
|
| 1976 | 1 |
0.1%
|
|
| 1980 | 1 |
0.1%
|
|
| 1984 | 3 |
0.3%
|
|
| 1985 | 1 |
0.1%
|
|
| 1986 | 1 |
0.1%
|
|
| 1988 | 2 |
0.2%
|
|
| 1989 | 5 |
0.5%
|
|
| 1990 | 1 |
0.1%
|
|
| 1991 | 3 |
0.3%
|
|
| 1992 | 3 |
0.3%
|
|
| 1993 | 6 |
0.6%
|
|
| 1994 | 6 |
0.6%
|
|
| 1995 | 5 |
0.5%
|
|
| 1996 | 6 |
0.6%
|
|
| 1997 | 17 |
1.8%
|
|
| 1998 | 13 |
1.4%
|
|
| 1999 | 19 |
2%
|
|
| 2000 | 19 |
2%
|
|
| 2001 | 7 |
0.7%
|
|
| Sysmiss | 651 |