| Year | Value | | 2022 | 8,948 | | 2021 | 8,847 | | 2020 | 8,753 | | 2019 | 8,553 | | 2018 | 8,374 | | 2017 | 8,215 | | 2016 | 8,065 | | 2015 | 7,919 | | 2014 | 7,774 | | 2013 | 7,629 | | 2012 | 7,480 | | 2011 | 7,324 | | 2010 | 7,159 | | 2009 | 6,978 | | 2008 | 6,768 | | 2007 | 6,551 | | 2006 | 6,376 | | 2005 | 6,264 | | 2004 | 6,206 | | 2003 | 6,204 | | 2002 | 6,229 | | 2001 | 6,208 | | 2000 | 6,095 | | 1999 | 5,901 | | 1998 | 5,632 | | 1997 | 5,302 | | 1996 | 4,966 | | 1995 | 4,666 | | 1994 | 4,393 | | 1993 | 4,132 | | 1992 | 3,890 | | 1991 | 3,674 | | 1990 | 3,482 | | 1989 | 3,321 | | 1988 | 3,205 | | 1987 | 3,129 | | 1986 | 3,077 | | 1985 | 3,051 | | 1984 | 3,057 | | 1983 | 3,102 | | 1982 | 3,170 | | 1981 | 3,217 | | 1980 | 3,215 | | 1979 | 3,153 | | 1978 | 3,028 | | 1977 | 2,863 | | 1976 | 2,721 | | 1975 | 2,638 | | 1974 | 2,608 | | 1973 | 2,634 | | 1972 | 2,702 | | 1971 | 2,769 | | 1970 | 2,806 | | 1969 | 2,822 | | 1968 | 2,822 | | 1967 | 2,801 | | 1966 | 2,767 | | 1965 | 2,729 | | 1964 | 2,682 | | 1963 | 2,618 | | 1962 | 2,544 | | 1961 | 2,474 | | 1960 | 2,412 |
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