| Year | Value | | 2022 | 41,457 | | 2021 | 44,323 | | 2020 | 54,222 | | 2019 | 62,564 | | 2018 | 66,532 | | 2017 | 68,305 | | 2016 | 67,411 | | 2015 | 65,869 | | 2014 | 64,219 | | 2013 | 64,274 | | 2012 | 64,909 | | 2011 | 65,009 | | 2010 | 67,619 | | 2009 | 72,308 | | 2008 | 75,008 | | 2007 | 73,971 | | 2006 | 68,926 | | 2005 | 60,457 | | 2004 | 50,007 | | 2003 | 42,216 | | 2002 | 40,457 | | 2001 | 41,312 | | 2000 | 41,596 | | 1999 | 41,099 | | 1998 | 39,770 | | 1997 | 37,776 | | 1996 | 35,398 | | 1995 | 32,983 | | 1994 | 30,855 | | 1993 | 29,235 | | 1992 | 28,262 | | 1991 | 28,002 | | 1990 | 28,612 | | 1989 | 29,491 | | 1988 | 29,899 | | 1987 | 29,858 | | 1986 | 29,448 | | 1985 | 28,834 | | 1984 | 28,183 | | 1983 | 27,568 | | 1982 | 27,050 | | 1981 | 26,742 | | 1980 | 26,547 | | 1979 | 26,051 | | 1978 | 25,039 | | 1977 | 23,561 | | 1976 | 21,690 | | 1975 | 19,544 | | 1974 | 17,273 | | 1973 | 15,016 | | 1972 | 12,901 | | 1971 | 11,203 | | 1970 | 10,340 | | 1969 | 10,068 | | 1968 | 9,940 | | 1967 | 9,960 | | 1966 | 10,118 | | 1965 | 10,358 | | 1964 | 10,422 | | 1963 | 10,239 | | 1962 | 9,958 | | 1961 | 9,607 | | 1960 | 9,209 |
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