| Year | Value | | 2022 | 51,433 | | 2021 | 49,535 | | 2020 | 47,825 | | 2019 | 46,285 | | 2018 | 44,634 | | 2017 | 43,142 | | 2016 | 41,575 | | 2015 | 39,724 | | 2014 | 38,264 | | 2013 | 37,219 | | 2012 | 36,526 | | 2011 | 36,511 | | 2010 | 36,395 | | 2009 | 35,264 | | 2008 | 34,557 | | 2007 | 34,161 | | 2006 | 33,422 | | 2005 | 32,453 | | 2004 | 31,619 | | 2003 | 30,889 | | 2002 | 30,208 | | 2001 | 29,526 | | 2000 | 28,818 | | 1999 | 28,063 | | 1998 | 27,249 | | 1997 | 26,358 | | 1996 | 25,351 | | 1995 | 24,216 | | 1994 | 22,978 | | 1993 | 21,651 | | 1992 | 20,278 | | 1991 | 18,957 | | 1990 | 17,772 | | 1989 | 16,723 | | 1988 | 15,817 | | 1987 | 15,059 | | 1986 | 14,394 | | 1985 | 13,777 | | 1984 | 13,207 | | 1983 | 12,682 | | 1982 | 12,212 | | 1981 | 11,828 | | 1980 | 11,523 | | 1979 | 11,280 | | 1978 | 11,091 | | 1977 | 10,922 | | 1976 | 10,735 | | 1975 | 10,535 | | 1974 | 10,337 | | 1973 | 10,143 | | 1972 | 9,956 | | 1971 | 9,793 | | 1970 | 9,664 | | 1969 | 9,558 | | 1968 | 9,466 | | 1967 | 9,376 | | 1966 | 9,265 | | 1965 | 9,118 | | 1964 | 8,939 | | 1963 | 8,739 | | 1962 | 8,529 | | 1961 | 8,334 | | 1960 | 8,177 |
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