| Year | Value | | 2022 | 50,373 | | 2021 | 48,424 | | 2020 | 46,438 | | 2019 | 44,176 | | 2018 | 41,834 | | 2017 | 39,662 | | 2016 | 37,635 | | 2015 | 35,731 | | 2014 | 33,930 | | 2013 | 32,223 | | 2012 | 30,609 | | 2011 | 29,078 | | 2010 | 27,621 | | 2009 | 26,231 | | 2008 | 24,899 | | 2007 | 23,621 | | 2006 | 22,393 | | 2005 | 21,221 | | 2004 | 20,108 | | 2003 | 19,057 | | 2002 | 18,073 | | 2001 | 17,161 | | 2000 | 16,325 | | 1999 | 15,567 | | 1998 | 14,889 | | 1997 | 14,291 | | 1996 | 13,766 | | 1995 | 13,304 | | 1994 | 12,879 | | 1993 | 12,471 | | 1992 | 12,063 | | 1991 | 11,645 | | 1990 | 11,210 | | 1989 | 10,764 | | 1988 | 10,312 | | 1987 | 9,860 | | 1986 | 9,419 | | 1985 | 8,996 | | 1984 | 8,601 | | 1983 | 8,239 | | 1982 | 7,906 | | 1981 | 7,598 | | 1980 | 7,312 | | 1979 | 7,040 | | 1978 | 6,776 | | 1977 | 6,514 | | 1976 | 6,251 | | 1975 | 5,985 | | 1974 | 5,719 | | 1973 | 5,460 | | 1972 | 5,206 | | 1971 | 4,965 | | 1970 | 4,746 | | 1969 | 4,546 | | 1968 | 4,360 | | 1967 | 4,187 | | 1966 | 4,028 | | 1965 | 3,876 | | 1964 | 3,726 | | 1963 | 3,578 | | 1962 | 3,426 | | 1961 | 3,276 | | 1960 | 3,131 |
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