| Year | Count |
|---|---|
| 1941 | 41 |
| 1942 | 57 |
| 1943 | 53 |
| 1944 | 19 |
| 1946 | 42 |
| 1947 | 52 |
| 1948 | 25 |
| 1949 | 65 |
| 1950 | 65 |
| 1951 | 62 |
| 1952 | 41 |
| 1953 | 50 |
| 1954 | 57 |
| 1955 | 77 |
| 1956 | 136 |
| 1957 | 112 |
| 1958 | 98 |
| 1959 | 115 |
| 1960 | 79 |
| 1961 | 57 |
| 1962 | 67 |
| 1963 | 5 |
| 1964 | 50 |
| 1965 | 29 |
| 1966 | 32 |
| 1967 | 11 |
| 1968 | 10 |
| 1969 | 20 |
| 1970 | 5 |
| 1971 | 18 |
| 1986 | 5 |
| 1987 | 5 |
| 1988 | 5 |
| 1989 | 13 |
| 1990 | 14 |
| 1991 | 12 |
| 1992 | 47 |
| 1993 | 7 |
| 1994 | 21 |
| 1995 | 37 |
| 1996 | 5 |
| 1996 | 20 |
| 1997 | 20 |
| 1998 | 23 |
| 1999 | 20 |
| 2000 | 16 |
| 2001 | 34 |
| 2002 | 33 |
| 2003 | 27 |
| 2004 | 35 |
| 2005 | 20 |
| 2006 | 5 |
| 2007 | 5 |
| 2008 | 10 |
| 2010 | 6 |
| 2011 | 5 |