| Value | Category | Cases | |
|---|---|---|---|
| 99 | Missing | 2 |
0.2%
|
| 2000 | 2 |
0.2%
|
|
| 2001 | 1 |
0.1%
|
|
| 2003 | 1 |
0.1%
|
|
| 2004 | 1 |
0.1%
|
|
| 2005 | 5 |
0.5%
|
|
| 2006 | 4 |
0.4%
|
|
| 2007 | 9 |
0.9%
|
|
| 2008 | 37 |
3.9%
|
|
| 2009 | 71 |
7.4%
|
|
| 2010 | 121 |
12.6%
|
|
| 2011 | 219 |
22.8%
|
|
| 2012 | 387 |
40.3%
|
|
| 2013 | 100 |
10.4%
|
|
| Sysmiss | 765 |