| Year | Count |
|---|---|
| 1919 | 6 |
| 1923 | 6 |
| 1924 | 10 |
| 1926 | 11 |
| 1937 | 17 |
| 1940 | 11 |
| 1941 | 11 |
| 1942 | 20 |
| 1943 | 10 |
| 1944 | 6 |
| 1946 | 10 |
| 1947 | 21 |
| 1948 | 5 |
| 1950 | 10 |
| 1951 | 12 |
| 1958 | 26 |
| 1959 | 22 |
| 1960 | 12 |
| 1962 | 14 |
| 1969 | 5 |
| 1978 | 8 |
| 1983 | 19 |
| 1984 | 31 |
| 1985 | 175 |
| 1986 | 81 |
| 1987 | 161 |
| 1988 | 144 |
| 1989 | 158 |
| 1990 | 96 |
| 1991 | 95 |
| 1992 | 136 |
| 1993 | 78 |
| 1994 | 10 |
| 1995 | 50 |
| 1996 | 12 |
| 1997 | 13 |
| 1998 | 52 |
| 1999 | 10 |
| 2000 | 39 |
| 2001 | 28 |
| 2002 | 10 |
| 2004 | 12 |
| 2005 | 57 |
| 2006 | 54 |
| 2007 | 26 |
| 2008 | 6 |
| 2009 | 24 |
| 2010 | 17 |
| 2011 | 20 |
| 2012 | 14 |
| 2013 | 15 |
| 2016 | 10 |
| 2019 | 12 |