| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 2 |
0.1%
|
|
| 1998 | 2 |
0.1%
|
|
| 1999 | 1 |
0%
|
|
| 2000 | 3 |
0.1%
|
|
| 2001 | 4 |
0.2%
|
|
| 2002 | 11 |
0.5%
|
|
| 2003 | 16 |
0.7%
|
|
| 2004 | 16 |
0.7%
|
|
| 2005 | 35 |
1.6%
|
|
| 2006 | 30 |
1.3%
|
|
| 2007 | 24 |
1.1%
|
|
| 2008 | 32 |
1.4%
|
|
| 2009 | 28 |
1.2%
|
|
| 2010 | 19 |
0.8%
|
|
| 2011 | 6 |
0.3%
|
|
| 9998 | don't know | 59 |
2.6%
|
| 9999 | not applicable | 1959 |
87.2%
|
| 9999995 | missing:impute | 0 |
0%
|