| Value | Category | Cases | |
|---|---|---|---|
| 1960 | 1 |
0.3%
|
|
| 1965 | 1 |
0.3%
|
|
| 1967 | 1 |
0.3%
|
|
| 1969 | 1 |
0.3%
|
|
| 1970 | 4 |
1.4%
|
|
| 1973 | 3 |
1%
|
|
| 1977 | 1 |
0.3%
|
|
| 1978 | 3 |
1%
|
|
| 1979 | 1 |
0.3%
|
|
| 1983 | 1 |
0.3%
|
|
| 1991 | 1 |
0.3%
|
|
| 1995 | 2 |
0.7%
|
|
| 1997 | 1 |
0.3%
|
|
| 1998 | 1 |
0.3%
|
|
| 2002 | 1 |
0.3%
|
|
| 2003 | 2 |
0.7%
|
|
| 2005 | 1 |
0.3%
|
|
| 2010 | 4 |
1.4%
|
|
| 2011 | 13 |
4.5%
|
|
| 2012 | 47 |
16.4%
|
|
| 2013 | 103 |
36%
|
|
| 2014 | 20 |
7%
|
|
| 2015 | 8 |
2.8%
|
|
| 2016 | 1 |
0.3%
|
|
| Missing value | 64 |
22.4%
|