| Year | Value | | 2022 | 12,702 | | 2021 | 12,574 | | 2020 | 12,460 | | 2019 | 12,308 | | 2018 | 12,112 | | 2017 | 11,869 | | 2016 | 11,563 | | 2015 | 11,179 | | 2014 | 10,719 | | 2013 | 10,201 | | 2012 | 9,624 | | 2011 | 8,992 | | 2010 | 8,341 | | 2009 | 7,621 | | 2008 | 6,849 | | 2007 | 6,121 | | 2006 | 5,434 | | 2005 | 4,791 | | 2004 | 4,200 | | 2003 | 3,672 | | 2002 | 3,213 | | 2001 | 2,836 | | 2000 | 2,547 | | 1999 | 2,398 | | 1998 | 2,380 | | 1997 | 2,424 | | 1996 | 2,518 | | 1995 | 2,655 | | 1994 | 2,821 | | 1993 | 3,008 | | 1992 | 3,211 | | 1991 | 3,428 | | 1990 | 3,658 | | 1989 | 3,823 | | 1988 | 3,903 | | 1987 | 3,959 | | 1986 | 3,998 | | 1985 | 4,014 | | 1984 | 4,002 | | 1983 | 3,966 | | 1982 | 3,908 | | 1981 | 3,830 | | 1980 | 3,803 | | 1979 | 3,854 | | 1978 | 3,912 | | 1977 | 3,960 | | 1976 | 4,004 | | 1975 | 4,048 | | 1974 | 4,097 | | 1973 | 4,148 | | 1972 | 4,201 | | 1971 | 4,246 | | 1970 | 4,254 | | 1969 | 4,202 | | 1968 | 4,121 | | 1967 | 4,056 | | 1966 | 4,004 | | 1965 | 3,966 | | 1964 | 3,936 | | 1963 | 3,910 | | 1962 | 3,885 | | 1961 | 3,878 | | 1960 | 3,843 |
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