| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
0.1%
|
|
| 2003 | 1 |
0.1%
|
|
| 2004 | 3 |
0.2%
|
|
| 2005 | 2 |
0.1%
|
|
| 2006 | 4 |
0.3%
|
|
| 2007 | 4 |
0.3%
|
|
| 2008 | 2 |
0.1%
|
|
| 2011 | 3 |
0.2%
|
|
| 2012 | 987 |
73.8%
|
|
| 2013 | 181 |
13.5%
|
|
| 2014 | 36 |
2.7%
|
|
| 2015 | 12 |
0.9%
|
|
| 2016 | 31 |
2.3%
|
|
| 2017 | 41 |
3.1%
|
|
| 2018 | 29 |
2.2%
|
|
| Missing value | 1 |
0.1%
|