| Year | Value | | 2022 | 9,752 | | 2021 | 9,787 | | 2020 | 9,840 | | 2019 | 9,882 | | 2018 | 9,875 | | 2017 | 9,834 | | 2016 | 9,797 | | 2015 | 9,746 | | 2014 | 9,675 | | 2013 | 9,613 | | 2012 | 9,550 | | 2011 | 9,455 | | 2010 | 9,308 | | 2009 | 9,102 | | 2008 | 8,844 | | 2007 | 8,560 | | 2006 | 8,233 | | 2005 | 7,855 | | 2004 | 7,463 | | 2003 | 7,072 | | 2002 | 6,681 | | 2001 | 6,296 | | 2000 | 5,930 | | 1999 | 5,601 | | 1998 | 5,331 | | 1997 | 5,109 | | 1996 | 4,931 | | 1995 | 4,809 | | 1994 | 4,717 | | 1993 | 4,618 | | 1992 | 4,515 | | 1991 | 4,414 | | 1990 | 4,303 | | 1989 | 4,182 | | 1988 | 4,064 | | 1987 | 3,950 | | 1986 | 3,833 | | 1985 | 3,706 | | 1984 | 3,569 | | 1983 | 3,410 | | 1982 | 3,231 | | 1981 | 3,056 | | 1980 | 2,886 | | 1979 | 2,732 | | 1978 | 2,600 | | 1977 | 2,496 | | 1976 | 2,423 | | 1975 | 2,381 | | 1974 | 2,351 | | 1973 | 2,316 | | 1972 | 2,258 | | 1971 | 2,163 | | 1970 | 2,036 | | 1969 | 1,898 | | 1968 | 1,767 | | 1967 | 1,666 | | 1966 | 1,617 | | 1965 | 1,619 | | 1964 | 1,652 | | 1963 | 1,695 | | 1962 | 1,728 | | 1961 | 1,732 | | 1960 | 1,698 |
|