| Year | Count |
|---|---|
| 1949 | 15 |
| 1951 | 5 |
| 1952 | 12 |
| 1953 | 16 |
| 1954 | 33 |
| 1955 | 47 |
| 1956 | 138 |
| 1957 | 212 |
| 1958 | 275 |
| 1959 | 420 |
| 1960 | 548 |
| 1961 | 531 |
| 1962 | 579 |
| 1963 | 603 |
| 1964 | 717 |
| 1965 | 635 |
| 1966 | 704 |
| 1967 | 968 |
| 1968 | 1,441 |
| 1969 | 1,433 |
| 1970 | 1,656 |
| 1971 | 1,869 |
| 1972 | 1,760 |
| 1973 | 1,800 |
| 1974 | 1,792 |
| 1975 | 1,857 |
| 1976 | 1,735 |
| 1977 | 1,766 |
| 1978 | 1,545 |
| 1979 | 1,342 |
| 1980 | 1,358 |
| 1981 | 1,122 |
| 1982 | 1,155 |
| 1983 | 993 |
| 1984 | 1,010 |
| 1985 | 1,042 |
| 1986 | 905 |
| 1987 | 860 |
| 1988 | 813 |
| 1989 | 604 |
| 1990 | 604 |
| 1991 | 621 |
| 1992 | 509 |
| 1993 | 392 |
| 1994 | 343 |
| 1995 | 312 |
| 1996 | 305 |
| 1997 | 299 |
| 1998 | 193 |
| 1999 | 160 |
| 2000 | 102 |
| 2001 | 96 |
| 2002 | 76 |
| 2003 | 109 |
| 2004 | 36 |
| 2005 | 22 |
| 2006 | 34 |
| 2007 | 12 |
| 2008 | 11 |
| 2009 | 5 |
| 2010 | 20 |
| 2011 | 12 |
| 2024 | 5 |