| Year | Value | | 2022 | 3,900 | | 2021 | 3,945 | | 2020 | 3,983 | | 2019 | 4,030 | | 2018 | 4,087 | | 2017 | 4,166 | | 2016 | 4,271 | | 2015 | 4,380 | | 2014 | 4,492 | | 2013 | 4,606 | | 2012 | 4,687 | | 2011 | 4,729 | | 2010 | 4,769 | | 2009 | 4,810 | | 2008 | 4,852 | | 2007 | 4,898 | | 2006 | 4,943 | | 2005 | 4,986 | | 2004 | 5,025 | | 2003 | 5,061 | | 2002 | 5,108 | | 2001 | 5,154 | | 2000 | 5,203 | | 1999 | 5,243 | | 1998 | 5,280 | | 1997 | 5,317 | | 1996 | 5,346 | | 1995 | 5,370 | | 1994 | 5,395 | | 1993 | 5,410 | | 1992 | 5,419 | | 1991 | 5,426 | | 1990 | 5,449 | | 1989 | 5,469 | | 1988 | 5,479 | | 1987 | 5,480 | | 1986 | 5,480 | | 1985 | 5,476 | | 1984 | 5,466 | | 1983 | 5,473 | | 1982 | 5,472 | | 1981 | 5,459 | | 1980 | 5,425 | | 1979 | 5,363 | | 1978 | 5,243 | | 1977 | 5,075 | | 1976 | 4,905 | | 1975 | 4,737 | | 1974 | 4,575 | | 1973 | 4,495 | | 1972 | 4,506 | | 1971 | 4,520 | | 1970 | 4,530 | | 1969 | 4,543 | | 1968 | 4,542 | | 1967 | 4,522 | | 1966 | 4,505 | | 1965 | 4,505 | | 1964 | 4,520 | | 1963 | 4,535 | | 1962 | 4,540 | | 1961 | 4,542 | | 1960 | 4,545 |
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