| Year | Value | | 2022 | 7,568 | | 2021 | 7,262 | | 2020 | 6,975 | | 2019 | 6,650 | | 2018 | 6,324 | | 2017 | 5,996 | | 2016 | 5,637 | | 2015 | 5,227 | | 2014 | 4,847 | | 2013 | 4,574 | | 2012 | 4,345 | | 2011 | 4,184 | | 2010 | 4,133 | | 2009 | 4,112 | | 2008 | 4,097 | | 2007 | 4,111 | | 2006 | 4,149 | | 2005 | 4,223 | | 2004 | 4,280 | | 2003 | 4,299 | | 2002 | 4,280 | | 2001 | 4,202 | | 2000 | 4,070 | | 1999 | 3,942 | | 1998 | 3,855 | | 1997 | 3,762 | | 1996 | 3,701 | | 1995 | 3,666 | | 1994 | 3,594 | | 1993 | 3,519 | | 1992 | 3,435 | | 1991 | 3,302 | | 1990 | 3,153 | | 1989 | 3,061 | | 1988 | 2,999 | | 1987 | 2,941 | | 1986 | 2,894 | | 1985 | 2,860 | | 1984 | 2,849 | | 1983 | 2,817 | | 1982 | 2,753 | | 1981 | 2,726 | | 1980 | 2,706 | | 1979 | 2,662 | | 1978 | 2,646 | | 1977 | 2,649 | | 1976 | 2,598 | | 1975 | 2,503 | | 1974 | 2,410 | | 1973 | 2,327 | | 1972 | 2,283 | | 1971 | 2,293 | | 1970 | 2,306 | | 1969 | 2,299 | | 1968 | 2,315 | | 1967 | 2,334 | | 1966 | 2,325 | | 1965 | 2,263 | | 1964 | 2,185 | | 1963 | 2,095 | | 1962 | 1,950 | | 1961 | 1,807 | | 1960 | 1,729 |
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