| Year | Value | | 2022 | 5,107 | | 2021 | 4,914 | | 2020 | 4,760 | | 2019 | 4,615 | | 2018 | 4,491 | | 2017 | 4,409 | | 2016 | 4,353 | | 2015 | 4,318 | | 2014 | 4,298 | | 2013 | 4,284 | | 2012 | 4,269 | | 2011 | 4,256 | | 2010 | 4,247 | | 2009 | 4,243 | | 2008 | 4,243 | | 2007 | 4,246 | | 2006 | 4,250 | | 2005 | 4,250 | | 2004 | 4,247 | | 2003 | 4,239 | | 2002 | 4,227 | | 2001 | 4,212 | | 2000 | 4,207 | | 1999 | 4,223 | | 1998 | 4,266 | | 1997 | 4,341 | | 1996 | 4,436 | | 1995 | 4,537 | | 1994 | 4,631 | | 1993 | 4,704 | | 1992 | 4,770 | | 1991 | 4,859 | | 1990 | 4,850 | | 1989 | 4,728 | | 1988 | 4,612 | | 1987 | 4,502 | | 1986 | 4,393 | | 1985 | 4,281 | | 1984 | 4,165 | | 1983 | 4,040 | | 1982 | 3,903 | | 1981 | 3,754 | | 1980 | 3,589 | | 1979 | 3,502 | | 1978 | 3,377 | | 1977 | 3,152 | | 1976 | 2,975 | | 1975 | 2,828 | | 1974 | 2,693 | | 1973 | 2,587 | | 1972 | 2,495 | | 1971 | 2,410 | | 1970 | 2,345 | | 1969 | 2,299 | | 1968 | 2,272 | | 1967 | 2,256 | | 1966 | 2,253 | | 1965 | 2,259 | | 1964 | 2,271 | | 1963 | 2,273 | | 1962 | 2,255 | | 1961 | 2,237 | | 1960 | 2,208 |
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