| Year | Value | | 2022 | 4,746 | | 2021 | 4,584 | | 2020 | 4,449 | | 2019 | 4,396 | | 2018 | 4,431 | | 2017 | 4,518 | | 2016 | 4,648 | | 2015 | 4,815 | | 2014 | 5,012 | | 2013 | 5,234 | | 2012 | 5,469 | | 2011 | 5,707 | | 2010 | 5,941 | | 2009 | 6,161 | | 2008 | 6,362 | | 2007 | 6,531 | | 2006 | 6,656 | | 2005 | 6,746 | | 2004 | 6,815 | | 2003 | 6,865 | | 2002 | 6,901 | | 2001 | 6,915 | | 2000 | 6,886 | | 1999 | 6,795 | | 1998 | 6,659 | | 1997 | 6,498 | | 1996 | 6,334 | | 1995 | 6,185 | | 1994 | 6,048 | | 1993 | 5,936 | | 1992 | 5,856 | | 1991 | 5,802 | | 1990 | 5,767 | | 1989 | 5,695 | | 1988 | 5,563 | | 1987 | 5,409 | | 1986 | 5,226 | | 1985 | 4,955 | | 1984 | 4,602 | | 1983 | 4,280 | | 1982 | 4,000 | | 1981 | 3,753 | | 1980 | 3,602 | | 1979 | 3,502 | | 1978 | 3,379 | | 1977 | 3,276 | | 1976 | 3,232 | | 1975 | 3,245 | | 1974 | 3,293 | | 1973 | 3,344 | | 1972 | 3,394 | | 1971 | 3,423 | | 1970 | 3,447 | | 1969 | 3,540 | | 1968 | 3,767 | | 1967 | 4,117 | | 1966 | 4,519 | | 1965 | 4,869 | | 1964 | 5,062 | | 1963 | 5,040 | | 1962 | 4,814 | | 1961 | 4,446 | | 1960 | 4,033 |
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