| Year | Value | | 2022 | 29,259 | | 2021 | 29,114 | | 2020 | 28,485 | | 2019 | 27,419 | | 2018 | 26,125 | | 2017 | 24,865 | | 2016 | 23,851 | | 2015 | 23,103 | | 2014 | 22,527 | | 2013 | 21,789 | | 2012 | 20,498 | | 2011 | 18,872 | | 2010 | 17,308 | | 2009 | 15,795 | | 2008 | 14,328 | | 2007 | 13,021 | | 2006 | 11,787 | | 2005 | 10,563 | | 2004 | 9,340 | | 2003 | 8,171 | | 2002 | 7,147 | | 2001 | 6,263 | | 2000 | 5,527 | | 1999 | 5,014 | | 1998 | 4,753 | | 1997 | 4,681 | | 1996 | 4,719 | | 1995 | 4,842 | | 1994 | 5,005 | | 1993 | 5,148 | | 1992 | 5,268 | | 1991 | 5,400 | | 1990 | 5,531 | | 1989 | 5,630 | | 1988 | 5,715 | | 1987 | 5,795 | | 1986 | 5,840 | | 1985 | 5,806 | | 1984 | 5,696 | | 1983 | 5,530 | | 1982 | 5,332 | | 1981 | 5,163 | | 1980 | 5,073 | | 1979 | 5,023 | | 1978 | 4,946 | | 1977 | 4,816 | | 1976 | 4,627 | | 1975 | 4,392 | | 1974 | 4,140 | | 1973 | 3,904 | | 1972 | 3,706 | | 1971 | 3,559 | | 1970 | 3,539 | | 1969 | 3,606 | | 1968 | 3,646 | | 1967 | 3,649 | | 1966 | 3,640 | | 1965 | 3,565 | | 1964 | 3,476 | | 1963 | 3,453 | | 1962 | 3,438 | | 1961 | 3,366 | | 1960 | 3,422 |
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