| value | category | cases | |
|---|---|---|---|
| 1960 | 3 |
0.2%
|
|
| 1977 | 4 |
0.2%
|
|
| 1978 | 11 |
0.6%
|
|
| 1979 | 15 |
0.8%
|
|
| 1980 | 7 |
0.4%
|
|
| 1981 | 11 |
0.6%
|
|
| 1982 | 27 |
1.5%
|
|
| 1983 | 16 |
0.9%
|
|
| 1984 | 24 |
1.3%
|
|
| 1985 | 16 |
0.9%
|
|
| 1986 | 14 |
0.8%
|
|
| 1987 | 11 |
0.6%
|
|
| 1988 | 39 |
2.1%
|
|
| 1989 | 36 |
2%
|
|
| 1990 | 13 |
0.7%
|
|
| 1991 | 39 |
2.1%
|
|
| 1992 | 45 |
2.4%
|
|
| 1993 | 77 |
4.2%
|
|
| 1994 | 94 |
5.1%
|
|
| 1995 | 62 |
3.4%
|
|
| 1996 | 38 |
2.1%
|
|
| 1997 | 65 |
3.5%
|
|
| 1998 | 96 |
5.2%
|
|
| 1999 | 103 |
5.6%
|
|
| 2000 | 185 |
10%
|
|
| 2001 | 94 |
5.1%
|
|
| 2002 | 176 |
9.5%
|
|
| 2003 | 164 |
8.9%
|
|
| 2004 | 179 |
9.7%
|
|
| 2005 | 182 |
9.9%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | don't know | 0 |
0%
|
| 10001 | .Z | 36138 |