| Value | Category | Cases | |
|---|---|---|---|
| 0 | 598 |
31.2%
|
|
| 2003 | 4 |
0.2%
|
|
| 2005 | 3 |
0.2%
|
|
| 2006 | 20 |
1%
|
|
| 2007 | 58 |
3%
|
|
| 2008 | 166 |
8.7%
|
|
| 2009 | 124 |
6.5%
|
|
| 2010 | 260 |
13.6%
|
|
| 2011 | 189 |
9.9%
|
|
| 2012 | 213 |
11.1%
|
|
| 2013 | 134 |
7%
|
|
| 2014 | 88 |
4.6%
|
|
| 2015 | 57 |
3%
|
|
| Sysmiss | 27565 |