| Value | Category | Cases | |
|---|---|---|---|
| 0 | 230 |
71.7%
|
|
| 2006 | 2 |
0.6%
|
|
| 2009 | 1 |
0.3%
|
|
| 2010 | 2 |
0.6%
|
|
| 2011 | 1 |
0.3%
|
|
| 2012 | 3 |
0.9%
|
|
| 2013 | 2 |
0.6%
|
|
| 2014 | 8 |
2.5%
|
|
| 2015 | 10 |
3.1%
|
|
| 2016 | 1 |
0.3%
|
|
| 9999 | 61 |
19%
|
|
| Sysmiss | 140 |