| Year | Count |
|---|---|
| 1940 | 8 |
| 1942 | 15 |
| 1943 | 28 |
| 1947 | 6 |
| 1948 | 27 |
| 1952 | 14 |
| 1953 | 55 |
| 1954 | 59 |
| 1955 | 77 |
| 1956 | 127 |
| 1957 | 106 |
| 1958 | 66 |
| 1959 | 72 |
| 1960 | 98 |
| 1961 | 92 |
| 1962 | 23 |
| 1963 | 29 |
| 1964 | 39 |
| 1965 | 11 |
| 1966 | 27 |
| 1967 | 20 |
| 1968 | 6 |
| 1970 | 10 |
| 1971 | 20 |
| 1974 | 10 |
| 1977 | 67 |
| 1978 | 56 |
| 1979 | 21 |
| 2002 | 7 |
| 2003 | 20 |
| 2004 | 30 |
| 2005 | 44 |
| 2006 | 24 |
| 2007 | 39 |
| 2008 | 33 |
| 2009 | 7 |
| 2010 | 10 |
| 2011 | 5 |