| Year | Count |
|---|---|
| 1939 | 6 |
| 1940 | 21 |
| 1941 | 21 |
| 1943 | 6 |
| 1956 | 10 |
| 1962 | 33 |
| 1963 | 296 |
| 1964 | 76 |
| 1965 | 55 |
| 1966 | 44 |
| 1967 | 27 |
| 1968 | 38 |
| 1969 | 24 |
| 1970 | 43 |
| 1971 | 38 |
| 1972 | 14 |
| 1973 | 21 |
| 1974 | 11 |
| 1975 | 13 |
| 1976 | 17 |
| 1977 | 29 |
| 1978 | 6 |
| 1979 | 5 |
| 1980 | 23 |
| 1981 | 11 |
| 1982 | 7 |
| 1983 | 6 |
| 1985 | 7 |
| 1986 | 10 |
| 1987 | 6 |
| 1989 | 12 |
| 1990 | 12 |
| 1991 | 15 |
| 1992 | 9 |
| 1993 | 11 |
| 1994 | 7 |
| 1995 | 6 |
| 1998 | 7 |
| 1999 | 5 |
| 2005 | 6 |
| 2006 | 7 |
| 2009 | 8 |
| 2010 | 5 |
| 2011 | 10 |
| 2012 | 10 |
| 2013 | 12 |
| 2014 | 10 |
| 2016 | 12 |
| 2017 | 5 |
| 2018 | 7 |
| 2020 | 12 |
| 2021 | 6 |
| 2022 | 8 |
| 2023 | 7 |
| 2023 | 17 |
| 2024 | 6 |
| 2024 | 19 |