| Year | Value | | 2022 | 3,470 | | 2021 | 3,573 | | 2020 | 3,708 | | 2019 | 3,860 | | 2018 | 4,010 | | 2017 | 4,145 | | 2016 | 4,253 | | 2015 | 4,332 | | 2014 | 4,399 | | 2013 | 4,463 | | 2012 | 4,509 | | 2011 | 4,536 | | 2010 | 4,561 | | 2009 | 4,581 | | 2008 | 4,621 | | 2007 | 4,705 | | 2006 | 4,842 | | 2005 | 5,014 | | 2004 | 5,199 | | 2003 | 5,382 | | 2002 | 5,560 | | 2001 | 5,721 | | 2000 | 5,871 | | 1999 | 6,037 | | 1998 | 6,213 | | 1997 | 6,376 | | 1996 | 6,504 | | 1995 | 6,575 | | 1994 | 6,607 | | 1993 | 6,629 | | 1992 | 6,649 | | 1991 | 6,701 | | 1990 | 6,818 | | 1989 | 6,973 | | 1988 | 7,129 | | 1987 | 7,280 | | 1986 | 7,409 | | 1985 | 7,507 | | 1984 | 7,589 | | 1983 | 7,670 | | 1982 | 7,735 | | 1981 | 7,783 | | 1980 | 7,818 | | 1979 | 7,842 | | 1978 | 7,881 | | 1977 | 7,963 | | 1976 | 8,075 | | 1975 | 8,198 | | 1974 | 8,319 | | 1973 | 8,434 | | 1972 | 8,534 | | 1971 | 8,612 | | 1970 | 8,667 | | 1969 | 8,704 | | 1968 | 8,732 | | 1967 | 8,764 | | 1966 | 8,811 | | 1965 | 8,869 | | 1964 | 8,898 | | 1963 | 8,867 | | 1962 | 8,773 | | 1961 | 8,614 | | 1960 | 8,397 |
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