| Year | Value | | 2022 | 3,365 | | 2021 | 3,466 | | 2020 | 3,600 | | 2019 | 3,751 | | 2018 | 3,901 | | 2017 | 4,034 | | 2016 | 4,139 | | 2015 | 4,215 | | 2014 | 4,280 | | 2013 | 4,343 | | 2012 | 4,389 | | 2011 | 4,418 | | 2010 | 4,442 | | 2009 | 4,461 | | 2008 | 4,497 | | 2007 | 4,577 | | 2006 | 4,706 | | 2005 | 4,867 | | 2004 | 5,041 | | 2003 | 5,215 | | 2002 | 5,384 | | 2001 | 5,538 | | 2000 | 5,687 | | 1999 | 5,850 | | 1998 | 6,023 | | 1997 | 6,184 | | 1996 | 6,312 | | 1995 | 6,371 | | 1994 | 6,369 | | 1993 | 6,346 | | 1992 | 6,326 | | 1991 | 6,345 | | 1990 | 6,450 | | 1989 | 6,630 | | 1988 | 6,828 | | 1987 | 7,015 | | 1986 | 7,176 | | 1985 | 7,298 | | 1984 | 7,390 | | 1983 | 7,469 | | 1982 | 7,528 | | 1981 | 7,571 | | 1980 | 7,604 | | 1979 | 7,625 | | 1978 | 7,664 | | 1977 | 7,745 | | 1976 | 7,858 | | 1975 | 7,979 | | 1974 | 8,097 | | 1973 | 8,204 | | 1972 | 8,298 | | 1971 | 8,370 | | 1970 | 8,418 | | 1969 | 8,453 | | 1968 | 8,478 | | 1967 | 8,507 | | 1966 | 8,550 | | 1965 | 8,602 | | 1964 | 8,627 | | 1963 | 8,594 | | 1962 | 8,504 | | 1961 | 8,353 | | 1960 | 8,148 |
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