| Year | Value | | 2022 | 13,002 | | 2021 | 13,077 | | 2020 | 13,145 | | 2019 | 13,157 | | 2018 | 13,088 | | 2017 | 12,932 | | 2016 | 12,691 | | 2015 | 12,367 | | 2014 | 11,971 | | 2013 | 11,543 | | 2012 | 11,112 | | 2011 | 10,667 | | 2010 | 10,202 | | 2009 | 9,682 | | 2008 | 9,094 | | 2007 | 8,457 | | 2006 | 7,773 | | 2005 | 7,076 | | 2004 | 6,404 | | 2003 | 5,800 | | 2002 | 5,297 | | 2001 | 4,912 | | 2000 | 4,642 | | 1999 | 4,484 | | 1998 | 4,421 | | 1997 | 4,432 | | 1996 | 4,509 | | 1995 | 4,640 | | 1994 | 4,817 | | 1993 | 5,023 | | 1992 | 5,245 | | 1991 | 5,473 | | 1990 | 5,700 | | 1989 | 5,861 | | 1988 | 5,932 | | 1987 | 5,964 | | 1986 | 5,962 | | 1985 | 5,920 | | 1984 | 5,838 | | 1983 | 5,722 | | 1982 | 5,578 | | 1981 | 5,414 | | 1980 | 5,285 | | 1979 | 5,195 | | 1978 | 5,103 | | 1977 | 5,015 | | 1976 | 4,936 | | 1975 | 4,870 | | 1974 | 4,816 | | 1973 | 4,779 | | 1972 | 4,758 | | 1971 | 4,744 | | 1970 | 4,726 | | 1969 | 4,682 | | 1968 | 4,628 | | 1967 | 4,591 | | 1966 | 4,573 | | 1965 | 4,572 | | 1964 | 4,578 | | 1963 | 4,588 | | 1962 | 4,599 | | 1961 | 4,617 | | 1960 | 4,606 |
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