| Year | Value | | 2022 | 2,453 | | 2021 | 2,480 | | 2020 | 2,463 | | 2019 | 2,407 | | 2018 | 2,316 | | 2017 | 2,227 | | 2016 | 2,126 | | 2015 | 2,018 | | 2014 | 1,946 | | 2013 | 1,909 | | 2012 | 1,877 | | 2011 | 1,834 | | 2010 | 1,799 | | 2009 | 1,759 | | 2008 | 1,723 | | 2007 | 1,692 | | 2006 | 1,669 | | 2005 | 1,641 | | 2004 | 1,606 | | 2003 | 1,573 | | 2002 | 1,552 | | 2001 | 1,543 | | 2000 | 1,542 | | 1999 | 1,538 | | 1998 | 1,523 | | 1997 | 1,502 | | 1996 | 1,496 | | 1995 | 1,510 | | 1994 | 1,537 | | 1993 | 1,575 | | 1992 | 1,604 | | 1991 | 1,604 | | 1990 | 1,585 | | 1989 | 1,565 | | 1988 | 1,549 | | 1987 | 1,546 | | 1986 | 1,564 | | 1985 | 1,595 | | 1984 | 1,616 | | 1983 | 1,624 | | 1982 | 1,622 | | 1981 | 1,607 | | 1980 | 1,584 | | 1979 | 1,561 | | 1978 | 1,542 | | 1977 | 1,526 | | 1976 | 1,504 | | 1975 | 1,468 | | 1974 | 1,424 | | 1973 | 1,380 | | 1972 | 1,339 | | 1971 | 1,296 | | 1970 | 1,252 | | 1969 | 1,208 | | 1968 | 1,166 | | 1967 | 1,125 | | 1966 | 1,084 | | 1965 | 1,045 | | 1964 | 1,007 | | 1963 | 972 | | 1962 | 941 | | 1961 | 914 | | 1960 | 890 |
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