| Year | Value | | 2022 | 9,142 | | 2021 | 9,194 | | 2020 | 9,259 | | 2019 | 9,304 | | 2018 | 9,243 | | 2017 | 9,161 | | 2016 | 9,081 | | 2015 | 8,943 | | 2014 | 8,785 | | 2013 | 8,626 | | 2012 | 8,405 | | 2011 | 8,090 | | 2010 | 7,740 | | 2009 | 7,423 | | 2008 | 7,173 | | 2007 | 6,973 | | 2006 | 6,804 | | 2005 | 6,595 | | 2004 | 6,280 | | 2003 | 5,927 | | 2002 | 5,530 | | 2001 | 5,071 | | 2000 | 4,699 | | 1999 | 4,492 | | 1998 | 4,361 | | 1997 | 4,320 | | 1996 | 4,346 | | 1995 | 4,320 | | 1994 | 4,244 | | 1993 | 4,154 | | 1992 | 4,062 | | 1991 | 3,994 | | 1990 | 3,985 | | 1989 | 4,078 | | 1988 | 4,221 | | 1987 | 4,310 | | 1986 | 4,337 | | 1985 | 4,333 | | 1984 | 4,320 | | 1983 | 4,294 | | 1982 | 4,268 | | 1981 | 4,284 | | 1980 | 4,370 | | 1979 | 4,543 | | 1978 | 4,820 | | 1977 | 5,148 | | 1976 | 5,420 | | 1975 | 5,580 | | 1974 | 5,637 | | 1973 | 5,589 | | 1972 | 5,449 | | 1971 | 5,291 | | 1970 | 5,146 | | 1969 | 5,004 | | 1968 | 4,864 | | 1967 | 4,733 | | 1966 | 4,602 | | 1965 | 4,472 | | 1964 | 4,342 | | 1963 | 4,215 | | 1962 | 4,094 | | 1961 | 3,982 | | 1960 | 3,897 |
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