| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1997 | 1 |
0.3%
|
| 2 | 1999 | 2 |
0.6%
|
| 3 | 2000 | 6 |
1.9%
|
| 4 | 2001 | 2 |
0.6%
|
| 5 | 2002 | 3 |
1%
|
| 6 | 2003 | 23 |
7.3%
|
| 7 | 2004 | 5 |
1.6%
|
| 8 | 2005 | 7 |
2.2%
|
| 9 | 2006 | 8 |
2.5%
|
| 10 | 2007 | 11 |
3.5%
|
| 11 | 2008 | 15 |
4.8%
|
| 12 | 2009 | 21 |
6.7%
|
| 13 | 2010 | 34 |
10.8%
|
| 14 | 2011 | 30 |
9.5%
|
| 15 | 2012 | 34 |
10.8%
|
| 16 | 2013 | 31 |
9.8%
|
| 17 | 2014 | 17 |
5.4%
|
| 18 | 2015 | 15 |
4.8%
|
| 19 | 2016 | 31 |
9.8%
|
| 20 | 2017 | 11 |
3.5%
|
| 21 | 2018 | 6 |
1.9%
|
| 22 | 2019 | 2 |
0.6%
|