| Year | Value | | 2022 | 10,935 | | 2021 | 11,127 | | 2020 | 11,336 | | 2019 | 11,533 | | 2018 | 11,722 | | 2017 | 11,888 | | 2016 | 12,010 | | 2015 | 12,161 | | 2014 | 12,305 | | 2013 | 12,325 | | 2012 | 12,298 | | 2011 | 12,280 | | 2010 | 12,087 | | 2009 | 11,706 | | 2008 | 11,242 | | 2007 | 10,690 | | 2006 | 10,201 | | 2005 | 9,966 | | 2004 | 9,955 | | 2003 | 10,101 | | 2002 | 10,284 | | 2001 | 10,456 | | 2000 | 10,634 | | 1999 | 10,803 | | 1998 | 10,944 | | 1997 | 11,043 | | 1996 | 11,115 | | 1995 | 11,151 | | 1994 | 11,123 | | 1993 | 11,032 | | 1992 | 10,873 | | 1991 | 10,649 | | 1990 | 10,368 | | 1989 | 10,052 | | 1988 | 9,694 | | 1987 | 9,308 | | 1986 | 8,928 | | 1985 | 8,550 | | 1984 | 8,169 | | 1983 | 7,838 | | 1982 | 7,530 | | 1981 | 7,191 | | 1980 | 6,854 | | 1979 | 6,536 | | 1978 | 6,253 | | 1977 | 5,912 | | 1976 | 5,548 | | 1975 | 5,280 | | 1974 | 5,071 | | 1973 | 4,889 | | 1972 | 4,727 | | 1971 | 4,574 | | 1970 | 4,420 | | 1969 | 4,265 | | 1968 | 4,108 | | 1967 | 3,959 | | 1966 | 3,822 | | 1965 | 3,697 | | 1964 | 3,578 | | 1963 | 3,483 | | 1962 | 3,420 | | 1961 | 3,354 | | 1960 | 3,264 |
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