| Year | Value | | 2022 | 2,465 | | 2021 | 2,535 | | 2020 | 2,587 | | 2019 | 2,612 | | 2018 | 2,600 | | 2017 | 2,548 | | 2016 | 2,464 | | 2015 | 2,358 | | 2014 | 2,243 | | 2013 | 2,128 | | 2012 | 2,012 | | 2011 | 1,893 | | 2010 | 1,789 | | 2009 | 1,702 | | 2008 | 1,625 | | 2007 | 1,563 | | 2006 | 1,520 | | 2005 | 1,496 | | 2004 | 1,476 | | 2003 | 1,443 | | 2002 | 1,403 | | 2001 | 1,371 | | 2000 | 1,331 | | 1999 | 1,280 | | 1998 | 1,242 | | 1997 | 1,218 | | 1996 | 1,201 | | 1995 | 1,192 | | 1994 | 1,191 | | 1993 | 1,181 | | 1992 | 1,153 | | 1991 | 1,112 | | 1990 | 1,065 | | 1989 | 1,019 | | 1988 | 988 | | 1987 | 981 | | 1986 | 990 | | 1985 | 1,010 | | 1984 | 1,032 | | 1983 | 1,040 | | 1982 | 1,028 | | 1981 | 998 | | 1980 | 960 | | 1979 | 916 | | 1978 | 891 | | 1977 | 901 | | 1976 | 923 | | 1975 | 949 | | 1974 | 974 | | 1973 | 971 | | 1972 | 939 | | 1971 | 906 | | 1970 | 878 | | 1969 | 861 | | 1968 | 849 | | 1967 | 835 | | 1966 | 824 | | 1965 | 812 | | 1964 | 798 | | 1963 | 785 | | 1962 | 774 | | 1961 | 763 | | 1960 | 755 |
|