| Year | Value | | 2022 | 11,364 | | 2021 | 11,350 | | 2020 | 11,365 | | 2019 | 11,285 | | 2018 | 11,120 | | 2017 | 10,886 | | 2016 | 10,683 | | 2015 | 10,577 | | 2014 | 10,557 | | 2013 | 10,579 | | 2012 | 10,576 | | 2011 | 10,509 | | 2010 | 10,381 | | 2009 | 10,094 | | 2008 | 9,774 | | 2007 | 9,511 | | 2006 | 9,256 | | 2005 | 9,088 | | 2004 | 8,996 | | 2003 | 8,884 | | 2002 | 8,709 | | 2001 | 8,523 | | 2000 | 8,121 | | 1999 | 7,637 | | 1998 | 7,195 | | 1997 | 6,774 | | 1996 | 6,492 | | 1995 | 6,281 | | 1994 | 6,124 | | 1993 | 5,932 | | 1992 | 5,652 | | 1991 | 5,376 | | 1990 | 5,120 | | 1989 | 4,858 | | 1988 | 4,579 | | 1987 | 4,308 | | 1986 | 4,149 | | 1985 | 4,089 | | 1984 | 4,044 | | 1983 | 4,126 | | 1982 | 4,280 | | 1981 | 4,359 | | 1980 | 4,393 | | 1979 | 4,369 | | 1978 | 4,299 | | 1977 | 4,211 | | 1976 | 4,120 | | 1975 | 4,013 | | 1974 | 3,889 | | 1973 | 3,765 | | 1972 | 3,648 | | 1971 | 3,538 | | 1970 | 3,430 | | 1969 | 3,323 | | 1968 | 3,216 | | 1967 | 3,113 | | 1966 | 3,015 | | 1965 | 2,915 | | 1964 | 2,815 | | 1963 | 2,716 | | 1962 | 2,616 | | 1961 | 2,517 | | 1960 | 2,420 |
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