| Value | Category | Cases | |
|---|---|---|---|
| 1 | yes | 191 |
9.1%
|
| 2 | no | 1712 |
81.3%
|
| 15 | 1 |
0%
|
|
| 1993 | 1 |
0%
|
|
| 1995 | 1 |
0%
|
|
| 1997 | 1 |
0%
|
|
| 1999 | 1 |
0%
|
|
| 2000 | 2 |
0.1%
|
|
| 2002 | 2 |
0.1%
|
|
| 2004 | 5 |
0.2%
|
|
| 2005 | 3 |
0.1%
|
|
| 2006 | 2 |
0.1%
|
|
| 2007 | 5 |
0.2%
|
|
| 2008 | 14 |
0.7%
|
|
| 2009 | 18 |
0.9%
|
|
| 2010 | 21 |
1%
|
|
| 2011 | 24 |
1.1%
|
|
| 2012 | 65 |
3.1%
|
|
| 2013 | 37 |
1.8%
|
|
| Sysmiss | 1033 |