| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 3 |
0.9%
|
|
| 2003 | 6 |
1.8%
|
|
| 2011 | 3 |
0.9%
|
|
| 2012 | 5 |
1.5%
|
|
| 2013 | 7 |
2.1%
|
|
| 2014 | 2 |
0.6%
|
|
| 2015 | 3 |
0.9%
|
|
| Missing value | 307 |
91.4%
|