| | | |
| 1955 | 2,156 | 14,742 |
| 1956 | 2,070 | 15,098 |
| 1957 | 2,203 | 15,983 |
| 1958 | 2,267 | 16,562 |
| 1959 | 2,137 | 16,163 |
| 1960 | 2,210 | 16,532 |
| 1961 | 2,023 | 15,823 |
| 1962 | 2,116 | 16,838 |
| 1963 | 2,253 | 18,318 |
| 1964 | 2,213 | 19,238 |
| 1965 | 2,303 | 20,283 |
| 1966 | 2,237 | 20,662 |
| 1967 | 2,142 | 19,989 |
| 1968 | 2,381 | 23,159 |
| 1969 | 2,355 | 25,477 |
| 1970 | 2,442 | 26,593 |
| 1971 | 2,486 | 28,357 |
| 1972 | 2,665 | 29,161 |
| 1973 | 2,672 | 29,347 |
| 1974 | 2,876 | 32,458 |
| 1975 | 3,100 | 32,335 |
| 1976 | 3,287 | 29,314 |
| 1977 | 3,691 | 29,253 |
| 1978 | 3,917 | 29,379 |
| 1979 | 4,196 | 29,924 |
| 1980 | 4,439 | 29,592 |
| 1981 | 4,629 | 29,848 |
| 1982 | 4,691 | 29,700 |
| 1983 | 5,061 | 30,724 |
| 1984 | 4,834 | 29,871 |
| 1985 | 4,911 | 29,158 |
| 1986 | 5,086 | 30,113 |
| 1987 | 5,289 | 30,116 |
| 1988 | 5,592 | 31,218 |
| 1989 | 5,829 | 32,303 |
| 1990 | 6,325 | 31,746 |
| 1991 | 6,291 | 32,291 |
| 1992 | 7,029 | 32,769 |
| 1993 | 7,324 | 34,856 |
| 1994 | 8,232 | 36,035 |
| 1995 | 9,402 | 35,990 |
| 1996 | 8,578 | 36,081 |
| 1997 | 9,099 | 37,611 |
| 1998 | 9,886 | 40,137 |
| 1999 | 10,683 | 40,236 |
| 2000 | 10,723 | 38,894 |
| 2001 | 11,164 | 38,924 |
| 2002 | 10,939 | 39,718 |
| 2003 | 10,689 | 39,154 |
| 2004 | 11,181 | 39,855 |
| 2005 | 11,030 | 41,029 |
| 2006 | 13,439 | 44,685 |
| 2007 | 13,105 | 46,448 |
| 2008 | 13,488 | 50,038 |
| 2009 | 13,233 | 48,997 |
| 2010 | 13,042 | 47,855 |
| 2011 | 13,460 | 51,271 |
| 2012 | 13,685 | 50,474 |
| 2013 | 14,735 | 52,705 |
| 2014 | 14,430 | 50,797 |
| 2015 | 14,487 | 53,579 |
| 2016 | 14,819 | 52,809 |
| 2017 | 14,741 | 50,029 |
| 2018 | 15,605 | 49,410 |
| 2019 | 15,992 | 48,056 |
| 2020 | 15,307 | 39,984 |
| 2021 | 16,300 | 51,605 |
