| Value | Category | Cases | |
|---|---|---|---|
| 2010 | 1 |
0.1%
|
|
| 2011 | 1 |
0.1%
|
|
| 2012 | 1595 |
98.2%
|
|
| 2013 | 28 |
1.7%
|
|
| Sysmiss | 953 |