| Year | Value | | 2022 | 2,519 | | 2021 | 2,489 | | 2020 | 2,437 | | 2019 | 2,322 | | 2018 | 2,198 | | 2017 | 2,114 | | 2016 | 2,038 | | 2015 | 1,988 | | 2014 | 1,996 | | 2013 | 1,997 | | 2012 | 1,987 | | 2011 | 1,953 | | 2010 | 1,909 | | 2009 | 1,875 | | 2008 | 1,851 | | 2007 | 1,834 | | 2006 | 1,823 | | 2005 | 1,805 | | 2004 | 1,780 | | 2003 | 1,764 | | 2002 | 1,761 | | 2001 | 1,763 | | 2000 | 1,773 | | 1999 | 1,783 | | 1998 | 1,771 | | 1997 | 1,742 | | 1996 | 1,717 | | 1995 | 1,702 | | 1994 | 1,702 | | 1993 | 1,719 | | 1992 | 1,736 | | 1991 | 1,734 | | 1990 | 1,718 | | 1989 | 1,699 | | 1988 | 1,676 | | 1987 | 1,657 | | 1986 | 1,651 | | 1985 | 1,653 | | 1984 | 1,651 | | 1983 | 1,639 | | 1982 | 1,618 | | 1981 | 1,588 | | 1980 | 1,553 | | 1979 | 1,514 | | 1978 | 1,475 | | 1977 | 1,435 | | 1976 | 1,389 | | 1975 | 1,337 | | 1974 | 1,288 | | 1973 | 1,243 | | 1972 | 1,202 | | 1971 | 1,162 | | 1970 | 1,123 | | 1969 | 1,083 | | 1968 | 1,043 | | 1967 | 1,007 | | 1966 | 969 | | 1965 | 933 | | 1964 | 902 | | 1963 | 874 | | 1962 | 848 | | 1961 | 828 | | 1960 | 811 |
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