| Value | Category | Cases | |
|---|---|---|---|
| 1972 | 1 |
0%
|
|
| 1973 | 1 |
0%
|
|
| 1975 | 1 |
0%
|
|
| 1978 | 1 |
0%
|
|
| 1979 | 1 |
0%
|
|
| 1980 | 4 |
0%
|
|
| 1981 | 1 |
0%
|
|
| 1982 | 1 |
0%
|
|
| 1983 | 1 |
0%
|
|
| 1984 | 3 |
0%
|
|
| 1985 | 8 |
0%
|
|
| 1986 | 3 |
0%
|
|
| 1987 | 10 |
0%
|
|
| 1988 | 9 |
0%
|
|
| 1989 | 11 |
0%
|
|
| 1990 | 25 |
0%
|
|
| 1991 | 10 |
0%
|
|
| 1992 | 36 |
0%
|
|
| 1993 | 46 |
0%
|
|
| 1994 | 31 |
0%
|
|
| 1995 | 52 |
0%
|
|
| 1996 | 56 |
0.1%
|
|
| 1997 | 55 |
0%
|
|
| 1998 | 137 |
0.1%
|
|
| 1999 | 83 |
0.1%
|
|
| 2000 | 324 |
0.3%
|
|
| 2001 | 237 |
0.2%
|
|
| 2002 | 329 |
0.3%
|
|
| 2003 | 523 |
0.5%
|
|
| 2004 | 589 |
0.5%
|
|
| 2005 | 910 |
0.8%
|
|
| 2006 | 1181 |
1.1%
|
|
| 2007 | 1793 |
1.6%
|
|
| 2008 | 2967 |
2.7%
|
|
| 2009 | 4492 |
4.1%
|
|
| 2010 | 8853 |
8%
|
|
| 2011 | 15457 |
14%
|
|
| 2012 | 52728 |
47.7%
|
|
| 2013 | 19469 |
17.6%
|
