| Year | Count |
|---|---|
| 1917 | 10 |
| 1920 | 18 |
| 1921 | 12 |
| 1965 | 10 |
| 1966 | 511 |
| 1967 | 608 |
| 1968 | 667 |
| 1969 | 630 |
| 1970 | 832 |
| 1971 | 1,273 |
| 1972 | 1,448 |
| 1973 | 1,300 |
| 1974 | 1,540 |
| 1975 | 1,404 |
| 1976 | 1,506 |
| 1977 | 1,383 |
| 1978 | 1,254 |
| 1979 | 1,239 |
| 1980 | 1,152 |
| 1981 | 875 |
| 1982 | 880 |
| 1983 | 822 |
| 1984 | 750 |
| 1985 | 682 |
| 1986 | 690 |
| 1987 | 669 |
| 1988 | 603 |
| 1989 | 625 |
| 1990 | 500 |
| 1991 | 455 |
| 1992 | 428 |
| 1993 | 453 |
| 1994 | 455 |
| 1995 | 349 |
| 1996 | 264 |
| 1997 | 260 |
| 1998 | 284 |
| 1999 | 195 |
| 2000 | 141 |
| 2001 | 181 |
| 2002 | 237 |
| 2003 | 195 |
| 2004 | 299 |
| 2005 | 235 |
| 2006 | 251 |
| 2007 | 212 |
| 2008 | 411 |
| 2009 | 366 |
| 2010 | 283 |
| 2011 | 222 |
| 2012 | 266 |
| 2013 | 223 |
| 2014 | 200 |
| 2015 | 321 |
| 2016 | 234 |
| 2017 | 243 |
| 2018 | 190 |
| 2019 | 225 |
| 2020 | 188 |
| 2021 | 166 |
| 2022 | 235 |
| 2023 | 123 |
| 2024 | 227 |