| Year | Value | | 2022 | 8,998 | | 2021 | 9,279 | | 2020 | 9,524 | | 2019 | 9,684 | | 2018 | 9,708 | | 2017 | 9,618 | | 2016 | 9,452 | | 2015 | 9,230 | | 2014 | 9,013 | | 2013 | 8,795 | | 2012 | 8,623 | | 2011 | 8,438 | | 2010 | 8,204 | | 2009 | 7,939 | | 2008 | 7,653 | | 2007 | 7,347 | | 2006 | 7,045 | | 2005 | 6,748 | | 2004 | 6,483 | | 2003 | 6,270 | | 2002 | 6,093 | | 2001 | 5,948 | | 2000 | 5,839 | | 1999 | 5,754 | | 1998 | 5,669 | | 1997 | 5,567 | | 1996 | 5,421 | | 1995 | 5,234 | | 1994 | 5,021 | | 1993 | 4,805 | | 1992 | 4,623 | | 1991 | 4,481 | | 1990 | 4,366 | | 1989 | 4,257 | | 1988 | 4,155 | | 1987 | 4,055 | | 1986 | 3,943 | | 1985 | 3,823 | | 1984 | 3,702 | | 1983 | 3,583 | | 1982 | 3,472 | | 1981 | 3,373 | | 1980 | 3,294 | | 1979 | 3,245 | | 1978 | 3,211 | | 1977 | 3,163 | | 1976 | 3,094 | | 1975 | 3,036 | | 1974 | 2,986 | | 1973 | 2,916 | | 1972 | 2,835 | | 1971 | 2,703 | | 1970 | 2,524 | | 1969 | 2,411 | | 1968 | 2,400 | | 1967 | 2,379 | | 1966 | 2,353 | | 1965 | 2,330 | | 1964 | 2,324 | | 1963 | 2,309 | | 1962 | 2,292 | | 1961 | 2,278 | | 1960 | 2,257 |
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