| 1965 | 1 |
| 1966 | 1 |
| 1967 | 10 |
| 1968 | 14 |
| 1969 | 24 |
| 1970 | 19 |
| 1971 | 25 |
| 1972 | 34 |
| 1973 | 47 |
| 1974 | 56 |
| 1975 | 76 |
| 1976 | 73 |
| 1977 | 78 |
| 1978 | 89 |
| 1979 | 104 |
| 1980 | 114 |
| 1981 | 126 |
| 1982 | 129 |
| 1983 | 141 |
| 1984 | 168 |
| 1985 | 193 |
| 1986 | 203 |
| 1987 | 154 |
| 1988 | 210 |
| 1989 | 216 |
| 1990 | 134 |
| 1991 | 154 |
| 1992 | 198 |
| 1993 | 157 |
| 1994 | 204 |
| 1995 | 213 |
| 1996 | 187 |
| 1997 | 184 |
| 1998 | 330 |
| 1999 | 325 |
| 2000 | 340 |
| 2001 | 392 |
| 2002 | 351 |
| 2003 | 453 |
| 2004 | 472 |
| 2005 | 447 |
| 2006 | 521 |
| 2007 | 651 |
| 2008 | 499 |
| 2009 | 463 |
| 2010 | 491 |
| 2011 | 496 |
| 2012 | 450 |
| 2013 | 578 |
| 2014 | 600 |
| 2015 | 581 |
| 2016 | 570 |
| 2017 | 483 |
| 2018 | 458 |
| 2019 | 552 |
| 2020 | 474 |
| 2021 | 482 |
| 2022 | 524 |
| 2023 | 111 |