| Year | Value | | 2022 | 6,488 | | 2021 | 6,324 | | 2020 | 6,260 | | 2019 | 6,114 | | 2018 | 5,904 | | 2017 | 5,723 | | 2016 | 5,568 | | 2015 | 5,453 | | 2014 | 5,368 | | 2013 | 5,274 | | 2012 | 5,164 | | 2011 | 5,048 | | 2010 | 4,938 | | 2009 | 4,831 | | 2008 | 4,722 | | 2007 | 4,568 | | 2006 | 4,372 | | 2005 | 4,180 | | 2004 | 3,998 | | 2003 | 3,827 | | 2002 | 3,679 | | 2001 | 3,538 | | 2000 | 3,395 | | 1999 | 3,256 | | 1998 | 3,124 | | 1997 | 3,006 | | 1996 | 2,942 | | 1995 | 2,935 | | 1994 | 2,952 | | 1993 | 2,984 | | 1992 | 3,025 | | 1991 | 3,072 | | 1990 | 3,115 | | 1989 | 3,155 | | 1988 | 3,190 | | 1987 | 3,213 | | 1986 | 3,123 | | 1985 | 2,960 | | 1984 | 2,835 | | 1983 | 2,717 | | 1982 | 2,599 | | 1981 | 2,484 | | 1980 | 2,369 | | 1979 | 2,254 | | 1978 | 2,152 | | 1977 | 2,052 | | 1976 | 1,972 | | 1975 | 1,927 | | 1974 | 1,891 | | 1973 | 1,868 | | 1972 | 1,856 | | 1971 | 1,850 | | 1970 | 1,842 | | 1969 | 1,828 | | 1968 | 1,810 | | 1967 | 1,795 | | 1966 | 1,767 | | 1965 | 1,730 | | 1964 | 1,712 | | 1963 | 1,703 | | 1962 | 1,697 | | 1961 | 1,697 | | 1960 | 1,708 |
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