| Year | Value | | 2022 | 5,643 | | 2021 | 5,747 | | 2020 | 5,781 | | 2019 | 5,770 | | 2018 | 5,737 | | 2017 | 5,689 | | 2016 | 5,640 | | 2015 | 5,601 | | 2014 | 5,577 | | 2013 | 5,558 | | 2012 | 5,532 | | 2011 | 5,492 | | 2010 | 5,423 | | 2009 | 5,307 | | 2008 | 5,148 | | 2007 | 4,963 | | 2006 | 4,757 | | 2005 | 4,543 | | 2004 | 4,346 | | 2003 | 4,145 | | 2002 | 3,932 | | 2001 | 3,747 | | 2000 | 3,580 | | 1999 | 3,407 | | 1998 | 3,266 | | 1997 | 3,172 | | 1996 | 3,112 | | 1995 | 3,113 | | 1994 | 3,185 | | 1993 | 3,312 | | 1992 | 3,472 | | 1991 | 3,628 | | 1990 | 3,740 | | 1989 | 3,785 | | 1988 | 3,756 | | 1987 | 3,666 | | 1986 | 3,540 | | 1985 | 3,394 | | 1984 | 3,242 | | 1983 | 3,098 | | 1982 | 2,960 | | 1981 | 2,822 | | 1980 | 2,692 | | 1979 | 2,559 | | 1978 | 2,473 | | 1977 | 2,445 | | 1976 | 2,425 | | 1975 | 2,406 | | 1974 | 2,375 | | 1973 | 2,347 | | 1972 | 2,326 | | 1971 | 2,277 | | 1970 | 2,201 | | 1969 | 2,121 | | 1968 | 2,078 | | 1967 | 2,068 | | 1966 | 2,049 | | 1965 | 1,993 | | 1964 | 1,908 | | 1963 | 1,834 | | 1962 | 1,771 | | 1961 | 1,719 | | 1960 | 1,679 |
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