| Year | Value | | 2022 | 16,122 | | 2021 | 15,876 | | 2020 | 15,469 | | 2019 | 14,935 | | 2018 | 14,360 | | 2017 | 13,810 | | 2016 | 13,304 | | 2015 | 12,853 | | 2014 | 12,460 | | 2013 | 12,095 | | 2012 | 11,712 | | 2011 | 11,264 | | 2010 | 10,721 | | 2009 | 10,112 | | 2008 | 9,500 | | 2007 | 8,962 | | 2006 | 8,589 | | 2005 | 8,385 | | 2004 | 8,286 | | 2003 | 8,115 | | 2002 | 7,834 | | 2001 | 7,550 | | 2000 | 7,273 | | 1999 | 7,007 | | 1998 | 6,736 | | 1997 | 6,463 | | 1996 | 6,218 | | 1995 | 6,025 | | 1994 | 5,932 | | 1993 | 5,935 | | 1992 | 5,941 | | 1991 | 5,917 | | 1990 | 5,878 | | 1989 | 5,798 | | 1988 | 5,673 | | 1987 | 5,551 | | 1986 | 5,434 | | 1985 | 5,308 | | 1984 | 5,197 | | 1983 | 5,107 | | 1982 | 5,025 | | 1981 | 4,936 | | 1980 | 4,833 | | 1979 | 4,707 | | 1978 | 4,561 | | 1977 | 4,409 | | 1976 | 4,266 | | 1975 | 4,143 | | 1974 | 4,049 | | 1973 | 3,987 | | 1972 | 3,967 | | 1971 | 3,996 | | 1970 | 4,058 | | 1969 | 4,121 | | 1968 | 4,150 | | 1967 | 4,125 | | 1966 | 4,052 | | 1965 | 3,954 | | 1964 | 3,841 | | 1963 | 3,754 | | 1962 | 3,738 | | 1961 | 3,707 | | 1960 | 3,621 |
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