| Year | Value | | 2022 | 7,783 | | 2021 | 7,588 | | 2020 | 7,429 | | 2019 | 7,312 | | 2018 | 7,228 | | 2017 | 7,164 | | 2016 | 7,103 | | 2015 | 7,021 | | 2014 | 6,926 | | 2013 | 6,830 | | 2012 | 6,735 | | 2011 | 6,642 | | 2010 | 6,549 | | 2009 | 6,494 | | 2008 | 6,471 | | 2007 | 6,432 | | 2006 | 6,376 | | 2005 | 6,305 | | 2004 | 6,219 | | 2003 | 6,123 | | 2002 | 6,036 | | 2001 | 5,988 | | 2000 | 5,993 | | 1999 | 6,018 | | 1998 | 6,003 | | 1997 | 5,909 | | 1996 | 5,742 | | 1995 | 5,549 | | 1994 | 5,360 | | 1993 | 5,171 | | 1992 | 4,976 | | 1991 | 4,778 | | 1990 | 4,571 | | 1989 | 4,350 | | 1988 | 4,141 | | 1987 | 3,946 | | 1986 | 3,771 | | 1985 | 3,610 | | 1984 | 3,460 | | 1983 | 3,315 | | 1982 | 3,179 | | 1981 | 3,050 | | 1980 | 2,915 | | 1979 | 2,779 | | 1978 | 2,651 | | 1977 | 2,523 | | 1976 | 2,402 | | 1975 | 2,289 | | 1974 | 2,187 | | 1973 | 2,092 | | 1972 | 2,002 | | 1971 | 1,918 | | 1970 | 1,840 | | 1969 | 1,807 | | 1968 | 1,819 | | 1967 | 1,835 | | 1966 | 1,858 | | 1965 | 1,891 | | 1964 | 1,932 | | 1963 | 1,979 | | 1962 | 2,031 | | 1961 | 2,085 | | 1960 | 2,133 |
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