| Year | Value | | 2024 | 775 | | 2023 | 784 | | 2022 | 798 | | 2021 | 807 | | 2020 | 815 | | 2019 | 817 | | 2018 | 811 | | 2017 | 805 | | 2016 | 805 | | 2015 | 813 | | 2014 | 833 | | 2013 | 859 | | 2012 | 881 | | 2011 | 905 | | 2010 | 930 | | 2009 | 958 | | 2008 | 990 | | 2007 | 1,028 | | 2006 | 1,075 | | 2005 | 1,120 | | 2004 | 1,146 | | 2003 | 1,155 | | 2002 | 1,152 | | 2001 | 1,133 | | 2000 | 1,104 | | 1999 | 1,067 | | 1998 | 1,028 | | 1997 | 992 | | 1996 | 955 | | 1995 | 910 | | 1994 | 857 | | 1993 | 812 | | 1992 | 778 | | 1991 | 748 | | 1990 | 717 | | 1989 | 668 | | 1988 | 603 | | 1987 | 542 | | 1986 | 493 | | 1985 | 451 | | 1984 | 409 | | 1983 | 365 | | 1982 | 321 | | 1981 | 281 | | 1980 | 259 | | 1979 | 258 | | 1978 | 263 | | 1977 | 268 | | 1976 | 274 | | 1975 | 274 |
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