| Year | Value | | 2022 | 763 | | 2021 | 803 | | 2020 | 851 | | 2019 | 900 | | 2018 | 947 | | 2017 | 997 | | 2016 | 1,045 | | 2015 | 1,095 | | 2014 | 1,149 | | 2013 | 1,208 | | 2012 | 1,269 | | 2011 | 1,312 | | 2010 | 1,347 | | 2009 | 1,395 | | 2008 | 1,454 | | 2007 | 1,516 | | 2006 | 1,577 | | 2005 | 1,637 | | 2004 | 1,700 | | 2003 | 1,723 | | 2002 | 1,699 | | 2001 | 1,708 | | 2000 | 1,760 | | 1999 | 1,818 | | 1998 | 1,878 | | 1997 | 1,940 | | 1996 | 2,006 | | 1995 | 2,074 | | 1994 | 2,144 | | 1993 | 2,215 | | 1992 | 2,286 | | 1991 | 2,252 | | 1990 | 2,221 | | 1989 | 2,189 | | 1988 | 2,164 | | 1987 | 2,154 | | 1986 | 2,375 | | 1985 | 2,604 | | 1984 | 2,851 | | 1983 | 3,122 | | 1982 | 3,405 | | 1981 | 3,701 | | 1980 | 4,006 | | 1979 | 4,328 | | 1978 | 4,657 | | 1977 | 4,995 | | 1976 | 5,329 | | 1975 | 5,647 | | 1974 | 5,966 | | 1973 | 6,265 | | 1972 | 6,556 | | 1971 | 6,869 | | 1970 | 7,304 | | 1969 | 7,594 | | 1968 | 7,744 | | 1967 | 7,775 | | 1966 | 7,828 | | 1965 | 7,876 | | 1964 | 7,903 | | 1963 | 7,926 | | 1962 | 7,942 | | 1961 | 7,947 | | 1960 | 7,949 |
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