| Year | Value | | 2022 | 56,991 | | 2021 | 56,313 | | 2020 | 55,473 | | 2019 | 54,253 | | 2018 | 52,964 | | 2017 | 51,893 | | 2016 | 51,017 | | 2015 | 50,272 | | 2014 | 49,599 | | 2013 | 49,088 | | 2012 | 48,717 | | 2011 | 48,388 | | 2010 | 47,631 | | 2009 | 46,361 | | 2008 | 45,021 | | 2007 | 43,656 | | 2006 | 42,309 | | 2005 | 40,997 | | 2004 | 39,707 | | 2003 | 38,425 | | 2002 | 37,132 | | 2001 | 36,106 | | 2000 | 35,381 | | 1999 | 34,726 | | 1998 | 33,902 | | 1997 | 32,702 | | 1996 | 31,331 | | 1995 | 29,950 | | 1994 | 28,561 | | 1993 | 27,284 | | 1992 | 26,138 | | 1991 | 25,029 | | 1990 | 23,948 | | 1989 | 22,877 | | 1988 | 21,444 | | 1987 | 19,973 | | 1986 | 19,035 | | 1985 | 18,344 | | 1984 | 17,736 | | 1983 | 17,209 | | 1982 | 16,765 | | 1981 | 16,403 | | 1980 | 16,109 | | 1979 | 15,839 | | 1978 | 15,506 | | 1977 | 14,995 | | 1976 | 14,198 | | 1975 | 13,371 | | 1974 | 12,691 | | 1973 | 12,038 | | 1972 | 11,405 | | 1971 | 10,799 | | 1970 | 10,232 | | 1969 | 9,707 | | 1968 | 9,218 | | 1967 | 8,756 | | 1966 | 8,312 | | 1965 | 7,884 | | 1964 | 7,473 | | 1963 | 7,080 | | 1962 | 6,701 | | 1961 | 6,337 | | 1960 | 5,996 |
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