| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1981 | 1 | 1485 |
0.1%
|
|
| 1985 | 1 | 146 |
0%
|
|
| 1986 | 1 | 1895 |
0.1%
|
|
| 1988 | 4 | 7217 |
0.3%
|
|
| 1989 | 6 | 8891 |
0.4%
|
|
| 1990 | 3 | 4452 |
0.2%
|
|
| 1991 | 2 | 3390 |
0.1%
|
|
| 1992 | 4 | 6272 |
0.3%
|
|
| 1993 | 3 | 5467 |
0.2%
|
|
| 1994 | 5 | 7186 |
0.3%
|
|
| 1995 | 12 | 19355 |
0.8%
|
|
| 1996 | 16 | 27660 |
1.1%
|
|
| 1997 | 12 | 21460 |
0.9%
|
|
| 1998 | 22 | 33739 |
1.4%
|
|
| 1999 | 26 | 36525 |
1.5%
|
|
| 2000 | 44 | 71699 |
2.9%
|
|
| 2001 | 32 | 48114 |
2%
|
|
| 2002 | 51 | 87893 |
3.6%
|
|
| 2003 | 49 | 73495 |
3%
|
|
| 2004 | 53 | 77152 |
3.2%
|
|
| 2005 | 64 | 96407 |
4%
|
|
| 2006 | 71 | 112008 |
4.6%
|
|
| 2007 | 91 | 123763 |
5.1%
|
|
| 2008 | 99 | 149854 |
6.2%
|
|
| 2009 | 137 | 216583 |
8.9%
|
|
| 2010 | 165 | 268431 |
11%
|
|
| 2011 | 337 | 557716 |
22.9%
|
|
| 2012 | 95 | 171277 |
7%
|
|
| 9998 | don't know | 41 | 68723 |
2.8%
|
| 9999 | don't search | 88 | 125771 |
5.2%
|
| Sysmiss | 47651 | 77627356 |