| Year | Value | | 2022 | 11,481 | | 2021 | 11,194 | | 2020 | 11,004 | | 2019 | 10,913 | | 2018 | 10,768 | | 2017 | 10,601 | | 2016 | 10,490 | | 2015 | 10,390 | | 2014 | 10,160 | | 2013 | 9,877 | | 2012 | 9,602 | | 2011 | 9,349 | | 2010 | 9,090 | | 2009 | 8,820 | | 2008 | 8,582 | | 2007 | 8,350 | | 2006 | 8,032 | | 2005 | 7,693 | | 2004 | 7,403 | | 2003 | 7,089 | | 2002 | 6,787 | | 2001 | 6,500 | | 2000 | 6,177 | | 1999 | 5,839 | | 1998 | 5,504 | | 1997 | 5,214 | | 1996 | 5,083 | | 1995 | 5,063 | | 1994 | 5,084 | | 1993 | 5,137 | | 1992 | 5,200 | | 1991 | 5,257 | | 1990 | 5,361 | | 1989 | 5,455 | | 1988 | 5,475 | | 1987 | 5,466 | | 1986 | 5,425 | | 1985 | 5,277 | | 1984 | 5,089 | | 1983 | 5,029 | | 1982 | 5,014 | | 1981 | 4,960 | | 1980 | 4,914 | | 1979 | 4,854 | | 1978 | 4,748 | | 1977 | 4,642 | | 1976 | 4,518 | | 1975 | 4,398 | | 1974 | 4,355 | | 1973 | 4,319 | | 1972 | 4,266 | | 1971 | 4,256 | | 1970 | 4,214 | | 1969 | 4,124 | | 1968 | 4,052 | | 1967 | 3,962 | | 1966 | 3,852 | | 1965 | 3,800 | | 1964 | 3,784 | | 1963 | 3,735 | | 1962 | 3,658 | | 1961 | 3,572 | | 1960 | 3,517 |
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