| Year | Value | | 2022 | 12,084 | | 2021 | 12,042 | | 2020 | 11,824 | | 2019 | 11,417 | | 2018 | 10,924 | | 2017 | 10,466 | | 2016 | 10,088 | | 2015 | 9,833 | | 2014 | 9,790 | | 2013 | 9,923 | | 2012 | 10,121 | | 2011 | 10,330 | | 2010 | 10,561 | | 2009 | 10,781 | | 2008 | 10,961 | | 2007 | 11,142 | | 2006 | 11,296 | | 2005 | 11,361 | | 2004 | 11,346 | | 2003 | 11,256 | | 2002 | 11,079 | | 2001 | 10,813 | | 2000 | 10,480 | | 1999 | 10,110 | | 1998 | 9,733 | | 1997 | 9,365 | | 1996 | 9,018 | | 1995 | 8,683 | | 1994 | 8,342 | | 1993 | 7,988 | | 1992 | 7,626 | | 1991 | 7,273 | | 1990 | 6,952 | | 1989 | 6,681 | | 1988 | 6,477 | | 1987 | 6,326 | | 1986 | 6,219 | | 1985 | 6,149 | | 1984 | 6,079 | | 1983 | 5,988 | | 1982 | 5,848 | | 1981 | 5,654 | | 1980 | 5,440 | | 1979 | 5,221 | | 1978 | 5,011 | | 1977 | 4,805 | | 1976 | 4,615 | | 1975 | 4,450 | | 1974 | 4,298 | | 1973 | 4,151 | | 1972 | 3,993 | | 1971 | 3,803 | | 1970 | 3,593 | | 1969 | 3,391 | | 1968 | 3,200 | | 1967 | 3,026 | | 1966 | 2,874 | | 1965 | 2,749 | | 1964 | 2,641 | | 1963 | 2,550 | | 1962 | 2,473 | | 1961 | 2,381 | | 1960 | 2,268 |
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