| Year | Value | | 2022 | 2,016 | | 2021 | 1,912 | | 2020 | 1,800 | | 2019 | 1,719 | | 2018 | 1,677 | | 2017 | 1,650 | | 2016 | 1,622 | | 2015 | 1,599 | | 2014 | 1,581 | | 2013 | 1,581 | | 2012 | 1,579 | | 2011 | 1,568 | | 2010 | 1,535 | | 2009 | 1,488 | | 2008 | 1,453 | | 2007 | 1,439 | | 2006 | 1,436 | | 2005 | 1,434 | | 2004 | 1,425 | | 2003 | 1,402 | | 2002 | 1,375 | | 2001 | 1,362 | | 2000 | 1,368 | | 1999 | 1,392 | | 1998 | 1,435 | | 1997 | 1,476 | | 1996 | 1,491 | | 1995 | 1,477 | | 1994 | 1,453 | | 1993 | 1,431 | | 1992 | 1,418 | | 1991 | 1,422 | | 1990 | 1,431 | | 1989 | 1,436 | | 1988 | 1,432 | | 1987 | 1,422 | | 1986 | 1,401 | | 1985 | 1,373 | | 1984 | 1,345 | | 1983 | 1,323 | | 1982 | 1,313 | | 1981 | 1,314 | | 1980 | 1,314 | | 1979 | 1,301 | | 1978 | 1,276 | | 1977 | 1,241 | | 1976 | 1,192 | | 1975 | 1,134 | | 1974 | 1,082 | | 1973 | 1,040 | | 1972 | 1,004 | | 1971 | 970 | | 1970 | 937 | | 1969 | 907 | | 1968 | 880 | | 1967 | 853 | | 1966 | 828 | | 1965 | 806 | | 1964 | 786 | | 1963 | 768 | | 1962 | 752 | | 1961 | 740 | | 1960 | 725 |
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