| Year | Value | | 2022 | 3,302 | | 2021 | 3,192 | | 2020 | 3,074 | | 2019 | 2,956 | | 2018 | 2,841 | | 2017 | 2,728 | | 2016 | 2,614 | | 2015 | 2,498 | | 2014 | 2,386 | | 2013 | 2,281 | | 2012 | 2,177 | | 2011 | 2,092 | | 2010 | 2,028 | | 2009 | 1,979 | | 2008 | 1,946 | | 2007 | 1,929 | | 2006 | 1,922 | | 2005 | 1,919 | | 2004 | 1,924 | | 2003 | 1,929 | | 2002 | 1,928 | | 2001 | 1,927 | | 2000 | 1,921 | | 1999 | 1,902 | | 1998 | 1,881 | | 1997 | 1,859 | | 1996 | 1,831 | | 1995 | 1,803 | | 1994 | 1,779 | | 1993 | 1,767 | | 1992 | 1,775 | | 1991 | 1,802 | | 1990 | 1,844 | | 1989 | 1,885 | | 1988 | 1,898 | | 1987 | 1,875 | | 1986 | 1,832 | | 1985 | 1,778 | | 1984 | 1,710 | | 1983 | 1,633 | | 1982 | 1,557 | | 1981 | 1,489 | | 1980 | 1,432 | | 1979 | 1,383 | | 1978 | 1,340 | | 1977 | 1,300 | | 1976 | 1,247 | | 1975 | 1,179 | | 1974 | 1,113 | | 1973 | 1,067 | | 1972 | 1,036 | | 1971 | 1,007 | | 1970 | 978 | | 1969 | 951 | | 1968 | 926 | | 1967 | 906 | | 1966 | 898 | | 1965 | 897 | | 1964 | 892 | | 1963 | 884 | | 1962 | 867 | | 1961 | 833 | | 1960 | 793 |
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