| Year | Value | | 2022 | 4,028 | | 2021 | 4,025 | | 2020 | 4,086 | | 2019 | 4,269 | | 2018 | 4,321 | | 2017 | 4,313 | | 2016 | 4,461 | | 2015 | 4,548 | | 2014 | 4,597 | | 2013 | 4,635 | | 2012 | 4,690 | | 2011 | 4,769 | | 2010 | 4,840 | | 2009 | 4,950 | | 2008 | 5,102 | | 2007 | 5,205 | | 2006 | 5,238 | | 2005 | 5,209 | | 2004 | 5,151 | | 2003 | 5,100 | | 2002 | 4,990 | | 2001 | 4,933 | | 2000 | 5,011 | | 1999 | 5,071 | | 1998 | 5,087 | | 1997 | 5,017 | | 1996 | 4,860 | | 1995 | 4,705 | | 1994 | 4,587 | | 1993 | 4,490 | | 1992 | 4,391 | | 1991 | 4,319 | | 1990 | 4,275 | | 1989 | 4,246 | | 1988 | 4,226 | | 1987 | 4,181 | | 1986 | 4,089 | | 1985 | 3,960 | | 1984 | 3,817 | | 1983 | 3,690 | | 1982 | 3,587 | | 1981 | 3,528 | | 1980 | 3,528 | | 1979 | 3,546 | | 1978 | 3,583 | | 1977 | 3,620 | | 1976 | 3,605 | | 1975 | 3,566 | | 1974 | 3,504 | | 1973 | 3,425 | | 1972 | 3,416 | | 1971 | 3,395 | | 1970 | 3,324 | | 1969 | 3,280 | | 1968 | 3,242 | | 1967 | 3,219 | | 1966 | 3,227 | | 1965 | 3,246 | | 1964 | 3,262 | | 1963 | 3,284 | | 1962 | 3,306 | | 1961 | 3,327 | | 1960 | 3,357 |
|