| Year | Value | | 2022 | 7,788 | | 2021 | 7,264 | | 2020 | 6,687 | | 2019 | 6,069 | | 2018 | 5,444 | | 2017 | 4,868 | | 2016 | 4,402 | | 2015 | 4,088 | | 2014 | 3,913 | | 2013 | 3,853 | | 2012 | 3,889 | | 2011 | 3,993 | | 2010 | 4,143 | | 2009 | 4,334 | | 2008 | 4,556 | | 2007 | 4,782 | | 2006 | 4,971 | | 2005 | 5,105 | | 2004 | 5,168 | | 2003 | 5,160 | | 2002 | 5,104 | | 2001 | 5,021 | | 2000 | 4,907 | | 1999 | 4,811 | | 1998 | 4,733 | | 1997 | 4,621 | | 1996 | 4,482 | | 1995 | 4,331 | | 1994 | 4,176 | | 1993 | 4,017 | | 1992 | 3,862 | | 1991 | 3,722 | | 1990 | 3,602 | | 1989 | 3,499 | | 1988 | 3,414 | | 1987 | 3,351 | | 1986 | 3,311 | | 1985 | 3,292 | | 1984 | 3,293 | | 1983 | 3,308 | | 1982 | 3,333 | | 1981 | 3,360 | | 1980 | 3,379 | | 1979 | 3,398 | | 1978 | 3,424 | | 1977 | 3,444 | | 1976 | 3,457 | | 1975 | 3,459 | | 1974 | 3,452 | | 1973 | 3,437 | | 1972 | 3,413 | | 1971 | 3,382 | | 1970 | 3,352 | | 1969 | 3,297 | | 1968 | 3,218 | | 1967 | 3,139 | | 1966 | 3,067 | | 1965 | 3,003 | | 1964 | 2,944 | | 1963 | 2,891 | | 1962 | 2,838 | | 1961 | 2,797 | | 1960 | 2,740 |
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