| Year | Value | | 2022 | 74,003 | | 2021 | 69,453 | | 2020 | 66,507 | | 2019 | 63,694 | | 2018 | 60,964 | | 2017 | 59,345 | | 2016 | 58,747 | | 2015 | 59,022 | | 2014 | 60,977 | | 2013 | 64,512 | | 2012 | 67,493 | | 2011 | 68,026 | | 2010 | 67,115 | | 2009 | 65,876 | | 2008 | 64,911 | | 2007 | 62,897 | | 2006 | 59,535 | | 2005 | 56,825 | | 2004 | 54,652 | | 2003 | 52,350 | | 2002 | 49,985 | | 2001 | 47,584 | | 2000 | 45,231 | | 1999 | 42,970 | | 1998 | 40,777 | | 1997 | 38,686 | | 1996 | 36,755 | | 1995 | 35,050 | | 1994 | 33,613 | | 1993 | 32,409 | | 1992 | 31,351 | | 1991 | 30,397 | | 1990 | 29,496 | | 1989 | 28,544 | | 1988 | 27,535 | | 1987 | 26,534 | | 1986 | 25,540 | | 1985 | 24,562 | | 1984 | 23,674 | | 1983 | 22,930 | | 1982 | 22,452 | | 1981 | 22,150 | | 1980 | 21,848 | | 1979 | 21,600 | | 1978 | 21,425 | | 1977 | 21,343 | | 1976 | 21,302 | | 1975 | 21,197 | | 1974 | 21,020 | | 1973 | 20,842 | | 1972 | 20,672 | | 1971 | 20,513 | | 1970 | 20,455 | | 1969 | 20,520 | | 1968 | 20,679 | | 1967 | 20,908 | | 1966 | 21,169 | | 1965 | 21,438 | | 1964 | 21,713 | | 1963 | 21,999 | | 1962 | 22,297 | | 1961 | 22,596 | | 1960 | 22,905 |
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