| Year | Value | | 2024 | 501 | | 2023 | 505 | | 2022 | 512 | | 2021 | 524 | | 2020 | 538 | | 2019 | 561 | | 2018 | 591 | | 2017 | 616 | | 2016 | 637 | | 2015 | 646 | | 2014 | 628 | | 2013 | 605 | | 2012 | 613 | | 2011 | 637 | | 2010 | 653 | | 2009 | 663 | | 2008 | 669 | | 2007 | 670 | | 2006 | 674 | | 2005 | 683 | | 2004 | 693 | | 2003 | 698 | | 2002 | 697 | | 2001 | 696 | | 2000 | 708 | | 1999 | 757 | | 1998 | 825 | | 1997 | 877 | | 1996 | 908 | | 1995 | 906 | | 1994 | 875 | | 1993 | 840 | | 1992 | 812 | | 1991 | 790 | | 1990 | 778 | | 1989 | 785 | | 1988 | 800 | | 1987 | 814 | | 1986 | 828 | | 1985 | 816 | | 1984 | 784 | | 1983 | 754 | | 1982 | 732 | | 1981 | 724 | | 1980 | 743 | | 1979 | 787 | | 1978 | 832 | | 1977 | 872 | | 1976 | 910 | | 1975 | 946 |
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