| Year | Value | | 2022 | 24,370 | | 2021 | 22,964 | | 2020 | 21,834 | | 2019 | 21,009 | | 2018 | 20,222 | | 2017 | 19,202 | | 2016 | 17,979 | | 2015 | 16,770 | | 2014 | 15,555 | | 2013 | 14,337 | | 2012 | 13,268 | | 2011 | 12,161 | | 2010 | 10,865 | | 2009 | 9,572 | | 2008 | 8,382 | | 2007 | 7,319 | | 2006 | 6,396 | | 2005 | 5,618 | | 2004 | 5,093 | | 2003 | 4,840 | | 2002 | 4,754 | | 2001 | 4,788 | | 2000 | 4,901 | | 1999 | 5,046 | | 1998 | 5,188 | | 1997 | 5,310 | | 1996 | 5,427 | | 1995 | 5,539 | | 1994 | 5,626 | | 1993 | 5,684 | | 1992 | 5,745 | | 1991 | 5,783 | | 1990 | 5,746 | | 1989 | 5,649 | | 1988 | 5,502 | | 1987 | 5,302 | | 1986 | 5,110 | | 1985 | 4,965 | | 1984 | 4,868 | | 1983 | 4,818 | | 1982 | 4,796 | | 1981 | 4,758 | | 1980 | 4,619 | | 1979 | 4,387 | | 1978 | 4,139 | | 1977 | 3,909 | | 1976 | 3,725 | | 1975 | 3,598 | | 1974 | 3,521 | | 1973 | 3,473 | | 1972 | 3,429 | | 1971 | 3,371 | | 1970 | 3,305 | | 1969 | 3,238 | | 1968 | 3,170 | | 1967 | 3,115 | | 1966 | 3,049 | | 1965 | 3,038 | | 1964 | 3,055 | | 1963 | 3,022 | | 1962 | 2,970 | | 1961 | 2,927 | | 1960 | 2,844 |
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