| Year | Value | | 2022 | 10,731 | | 2021 | 10,435 | | 2020 | 10,255 | | 2019 | 10,018 | | 2018 | 9,733 | | 2017 | 9,430 | | 2016 | 9,146 | | 2015 | 8,867 | | 2014 | 8,581 | | 2013 | 8,356 | | 2012 | 8,142 | | 2011 | 7,842 | | 2010 | 7,541 | | 2009 | 7,275 | | 2008 | 6,955 | | 2007 | 6,654 | | 2006 | 6,379 | | 2005 | 6,057 | | 2004 | 5,713 | | 2003 | 5,377 | | 2002 | 5,083 | | 2001 | 4,941 | | 2000 | 4,918 | | 1999 | 4,945 | | 1998 | 5,003 | | 1997 | 5,065 | | 1996 | 5,105 | | 1995 | 5,184 | | 1994 | 5,276 | | 1993 | 5,301 | | 1992 | 5,293 | | 1991 | 5,254 | | 1990 | 5,112 | | 1989 | 4,940 | | 1988 | 4,882 | | 1987 | 4,859 | | 1986 | 4,800 | | 1985 | 4,755 | | 1984 | 4,697 | | 1983 | 4,581 | | 1982 | 4,473 | | 1981 | 4,354 | | 1980 | 4,233 | | 1979 | 4,190 | | 1978 | 4,162 | | 1977 | 4,107 | | 1976 | 4,076 | | 1975 | 4,016 | | 1974 | 3,924 | | 1973 | 3,862 | | 1972 | 3,783 | | 1971 | 3,673 | | 1970 | 3,630 | | 1969 | 3,622 | | 1968 | 3,572 | | 1967 | 3,511 | | 1966 | 3,427 | | 1965 | 3,368 | | 1964 | 3,319 | | 1963 | 3,246 | | 1962 | 3,207 | | 1961 | 3,207 | | 1960 | 3,219 |
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