| Year | Value | | 2022 | 8,956 | | 2021 | 8,588 | | 2020 | 8,178 | | 2019 | 7,842 | | 2018 | 7,566 | | 2017 | 7,297 | | 2016 | 7,038 | | 2015 | 6,748 | | 2014 | 6,459 | | 2013 | 6,217 | | 2012 | 5,955 | | 2011 | 5,687 | | 2010 | 5,482 | | 2009 | 5,239 | | 2008 | 4,974 | | 2007 | 4,878 | | 2006 | 4,922 | | 2005 | 4,978 | | 2004 | 5,015 | | 2003 | 5,041 | | 2002 | 5,039 | | 2001 | 4,977 | | 2000 | 4,923 | | 1999 | 4,942 | | 1998 | 4,958 | | 1997 | 4,932 | | 1996 | 4,916 | | 1995 | 4,883 | | 1994 | 4,811 | | 1993 | 4,760 | | 1992 | 4,745 | | 1991 | 4,757 | | 1990 | 4,784 | | 1989 | 4,799 | | 1988 | 4,812 | | 1987 | 4,841 | | 1986 | 4,878 | | 1985 | 4,911 | | 1984 | 4,942 | | 1983 | 4,974 | | 1982 | 5,006 | | 1981 | 5,017 | | 1980 | 4,986 | | 1979 | 4,914 | | 1978 | 4,784 | | 1977 | 4,622 | | 1976 | 4,506 | | 1975 | 4,475 | | 1974 | 4,520 | | 1973 | 4,645 | | 1972 | 4,811 | | 1971 | 4,920 | | 1970 | 4,907 | | 1969 | 4,784 | | 1968 | 4,554 | | 1967 | 4,241 | | 1966 | 3,928 | | 1965 | 3,668 | | 1964 | 3,456 | | 1963 | 3,287 | | 1962 | 3,168 | | 1961 | 3,094 | | 1960 | 3,073 |
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