| Year | Value | | 2022 | 56,778 | | 2021 | 59,090 | | 2020 | 61,507 | | 2019 | 63,093 | | 2018 | 63,926 | | 2017 | 64,073 | | 2016 | 63,440 | | 2015 | 62,653 | | 2014 | 61,935 | | 2013 | 61,380 | | 2012 | 61,041 | | 2011 | 60,902 | | 2010 | 60,881 | | 2009 | 60,968 | | 2008 | 61,197 | | 2007 | 60,618 | | 2006 | 58,899 | | 2005 | 56,866 | | 2004 | 54,769 | | 2003 | 52,715 | | 2002 | 50,814 | | 2001 | 49,090 | | 2000 | 47,402 | | 1999 | 45,366 | | 1998 | 43,966 | | 1997 | 43,286 | | 1996 | 42,330 | | 1995 | 41,395 | | 1994 | 42,258 | | 1993 | 44,600 | | 1992 | 45,909 | | 1991 | 46,281 | | 1990 | 46,023 | | 1989 | 44,799 | | 1988 | 42,744 | | 1987 | 38,759 | | 1986 | 34,718 | | 1985 | 32,261 | | 1984 | 29,873 | | 1983 | 27,588 | | 1982 | 25,509 | | 1981 | 23,668 | | 1980 | 22,118 | | 1979 | 20,940 | | 1978 | 20,233 | | 1977 | 20,076 | | 1976 | 20,152 | | 1975 | 20,038 | | 1974 | 19,696 | | 1973 | 19,138 | | 1972 | 18,408 | | 1971 | 17,723 | | 1970 | 17,201 | | 1969 | 16,808 | | 1968 | 16,532 | | 1967 | 16,361 | | 1966 | 16,196 | | 1965 | 15,994 | | 1964 | 15,768 | | 1963 | 15,515 | | 1962 | 15,237 | | 1961 | 14,958 | | 1960 | 14,689 |
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