| Year | Value | | 2022 | 8,110 | | 2021 | 8,078 | | 2020 | 8,034 | | 2019 | 7,987 | | 2018 | 7,943 | | 2017 | 7,910 | | 2016 | 7,890 | | 2015 | 7,862 | | 2014 | 7,801 | | 2013 | 7,702 | | 2012 | 7,552 | | 2011 | 7,341 | | 2010 | 7,105 | | 2009 | 6,879 | | 2008 | 6,662 | | 2007 | 6,488 | | 2006 | 6,397 | | 2005 | 6,336 | | 2004 | 6,296 | | 2003 | 6,311 | | 2002 | 6,338 | | 2001 | 6,309 | | 2000 | 6,269 | | 1999 | 6,259 | | 1998 | 6,238 | | 1997 | 6,211 | | 1996 | 6,184 | | 1995 | 6,163 | | 1994 | 6,146 | | 1993 | 6,118 | | 1992 | 6,074 | | 1991 | 6,007 | | 1990 | 5,917 | | 1989 | 5,803 | | 1988 | 5,666 | | 1987 | 5,513 | | 1986 | 5,347 | | 1985 | 5,176 | | 1984 | 5,028 | | 1983 | 4,882 | | 1982 | 4,722 | | 1981 | 4,572 | | 1980 | 4,430 | | 1979 | 4,301 | | 1978 | 4,235 | | 1977 | 4,241 | | 1976 | 4,289 | | 1975 | 4,383 | | 1974 | 4,518 | | 1973 | 4,634 | | 1972 | 4,692 | | 1971 | 4,715 | | 1970 | 4,711 | | 1969 | 4,697 | | 1968 | 4,695 | | 1967 | 4,681 | | 1966 | 4,618 | | 1965 | 4,525 | | 1964 | 4,421 | | 1963 | 4,310 | | 1962 | 4,193 | | 1961 | 4,070 | | 1960 | 3,951 |
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