| Year | Value | | 2022 | 4,126 | | 2021 | 4,293 | | 2020 | 4,446 | | 2019 | 4,572 | | 2018 | 4,687 | | 2017 | 4,807 | | 2016 | 4,906 | | 2015 | 5,007 | | 2014 | 5,124 | | 2013 | 5,248 | | 2012 | 5,373 | | 2011 | 5,466 | | 2010 | 5,459 | | 2009 | 5,416 | | 2008 | 5,383 | | 2007 | 5,300 | | 2006 | 5,154 | | 2005 | 4,946 | | 2004 | 4,706 | | 2003 | 4,485 | | 2002 | 4,263 | | 2001 | 4,143 | | 2000 | 4,185 | | 1999 | 4,244 | | 1998 | 4,289 | | 1997 | 4,270 | | 1996 | 4,173 | | 1995 | 4,073 | | 1994 | 3,996 | | 1993 | 3,915 | | 1992 | 3,801 | | 1991 | 3,686 | | 1990 | 3,583 | | 1989 | 3,500 | | 1988 | 3,450 | | 1987 | 3,424 | | 1986 | 3,408 | | 1985 | 3,388 | | 1984 | 3,361 | | 1983 | 3,337 | | 1982 | 3,294 | | 1981 | 3,232 | | 1980 | 3,185 | | 1979 | 3,136 | | 1978 | 3,097 | | 1977 | 3,073 | | 1976 | 3,025 | | 1975 | 2,974 | | 1974 | 2,919 | | 1973 | 2,857 | | 1972 | 2,871 | | 1971 | 2,892 | | 1970 | 2,870 | | 1969 | 2,866 | | 1968 | 2,866 | | 1967 | 2,869 | | 1966 | 2,887 | | 1965 | 2,903 | | 1964 | 2,898 | | 1963 | 2,883 | | 1962 | 2,865 | | 1961 | 2,857 | | 1960 | 2,903 |
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