| Year | Value | | 2024 | 3,219 | | 2023 | 3,252 | | 2022 | 3,299 | | 2021 | 3,406 | | 2020 | 3,496 | | 2019 | 3,563 | | 2018 | 3,650 | | 2017 | 3,717 | | 2016 | 3,704 | | 2015 | 3,664 | | 2014 | 3,645 | | 2013 | 3,593 | | 2012 | 3,526 | | 2011 | 3,484 | | 2010 | 3,444 | | 2009 | 3,398 | | 2008 | 3,375 | | 2007 | 3,372 | | 2006 | 3,402 | | 2005 | 3,477 | | 2004 | 3,551 | | 2003 | 3,605 | | 2002 | 3,623 | | 2001 | 3,573 | | 2000 | 3,460 | | 1999 | 3,317 | | 1998 | 3,155 | | 1997 | 2,999 | | 1996 | 2,932 | | 1995 | 2,929 | | 1994 | 2,912 | | 1993 | 2,885 | | 1992 | 2,845 | | 1991 | 2,797 | | 1990 | 2,757 | | 1989 | 2,732 | | 1988 | 2,719 | | 1987 | 2,704 | | 1986 | 2,698 | | 1985 | 2,699 | | 1984 | 2,679 | | 1983 | 2,655 | | 1982 | 2,640 | | 1981 | 2,631 | | 1980 | 2,627 | | 1979 | 2,622 | | 1978 | 2,612 | | 1977 | 2,611 | | 1976 | 2,609 | | 1975 | 2,578 |
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