| Year | Value | | 2022 | 56,546 | | 2021 | 56,671 | | 2020 | 56,435 | | 2019 | 55,772 | | 2018 | 54,669 | | 2017 | 53,229 | | 2016 | 51,790 | | 2015 | 50,575 | | 2014 | 49,601 | | 2013 | 48,858 | | 2012 | 48,285 | | 2011 | 47,714 | | 2010 | 47,044 | | 2009 | 46,248 | | 2008 | 45,334 | | 2007 | 44,393 | | 2006 | 43,392 | | 2005 | 42,522 | | 2004 | 41,978 | | 2003 | 41,657 | | 2002 | 41,148 | | 2001 | 40,280 | | 2000 | 39,417 | | 1999 | 38,569 | | 1998 | 37,513 | | 1997 | 36,132 | | 1996 | 34,877 | | 1995 | 34,076 | | 1994 | 33,754 | | 1993 | 33,092 | | 1992 | 33,709 | | 1991 | 33,937 | | 1990 | 31,095 | | 1989 | 27,983 | | 1988 | 25,784 | | 1987 | 24,041 | | 1986 | 22,412 | | 1985 | 21,023 | | 1984 | 19,909 | | 1983 | 19,024 | | 1982 | 18,248 | | 1981 | 17,423 | | 1980 | 16,442 | | 1979 | 15,279 | | 1978 | 13,977 | | 1977 | 12,644 | | 1976 | 11,407 | | 1975 | 10,337 | | 1974 | 9,447 | | 1973 | 8,721 | | 1972 | 8,102 | | 1971 | 7,539 | | 1970 | 7,057 | | 1969 | 6,701 | | 1968 | 6,488 | | 1967 | 6,338 | | 1966 | 6,176 | | 1965 | 5,999 | | 1964 | 5,747 | | 1963 | 5,428 | | 1962 | 5,135 | | 1961 | 4,888 | | 1960 | 4,672 |
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