| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 2 |
0.9%
|
|
| 2003 | 4 |
1.8%
|
|
| 2011 | 2 |
0.9%
|
|
| 2012 | 4 |
1.8%
|
|
| 2013 | 4 |
1.8%
|
|
| 2014 | 2 |
0.9%
|
|
| 2015 | 2 |
0.9%
|
|
| Missing value | 206 |
91.2%
|