| Value | Category | Cases | |
|---|---|---|---|
| 1988 | 2 |
0.1%
|
|
| 1990 | 1 |
0.1%
|
|
| 1992 | 4 |
0.3%
|
|
| 1993 | 2 |
0.1%
|
|
| 1994 | 3 |
0.2%
|
|
| 1995 | 3 |
0.2%
|
|
| 1996 | 3 |
0.2%
|
|
| 1997 | 9 |
0.6%
|
|
| 1998 | 8 |
0.5%
|
|
| 1999 | 11 |
0.8%
|
|
| 2000 | 22 |
1.5%
|
|
| 2001 | 16 |
1.1%
|
|
| 2002 | 14 |
1%
|
|
| 2003 | 20 |
1.4%
|
|
| 2004 | 29 |
2%
|
|
| 2005 | 28 |
1.9%
|
|
| 2006 | 64 |
4.4%
|
|
| 2007 | 76 |
5.2%
|
|
| 2008 | 86 |
5.9%
|
|
| 2009 | 141 |
9.7%
|
|
| 2010 | 184 |
12.6%
|
|
| 2011 | 287 |
19.7%
|
|
| 2012 | 442 |
30.4%
|
|
| 9998 | don't know | 0 |
0%
|
| 9999 | not applicable | 0 |
0%
|
| 9999995 | missing:impute | 0 |
0%
|
| Sysmiss | 2778 |