Year | Value | 2022 | 6,777 | 2021 | 6,778 | 2020 | 6,729 | 2019 | 6,711 | 2018 | 6,734 | 2017 | 6,740 | 2016 | 6,745 | 2015 | 6,766 | 2014 | 6,812 | 2013 | 6,872 | 2012 | 6,929 | 2011 | 6,974 | 2010 | 6,986 | 2009 | 6,869 | 2008 | 6,650 | 2007 | 6,444 | 2006 | 6,257 | 2005 | 6,110 | 2004 | 6,025 | 2003 | 6,017 | 2002 | 6,078 | 2001 | 6,210 | 2000 | 6,367 | 1999 | 6,442 | 1998 | 6,441 | 1997 | 6,441 | 1996 | 6,495 | 1995 | 6,705 | 1994 | 7,113 | 1993 | 7,603 | 1992 | 8,061 | 1991 | 8,437 | 1990 | 8,573 | 1989 | 8,274 | 1988 | 7,774 | 1987 | 7,380 | 1986 | 7,075 | 1985 | 6,856 | 1984 | 6,739 | 1983 | 6,692 | 1982 | 6,658 | 1981 | 6,582 | 1980 | 6,393 | 1979 | 6,058 | 1978 | 5,649 | 1977 | 5,280 | 1976 | 5,005 | 1975 | 4,886 | 1974 | 5,021 | 1973 | 5,387 | 1972 | 5,921 | 1971 | 6,497 | 1970 | 6,857 | 1969 | 6,680 | 1968 | 6,007 | 1967 | 5,147 | 1966 | 4,294 | 1965 | 3,599 | 1964 | 3,143 | 1963 | 2,910 | 1962 | 2,831 | 1961 | 2,843 | 1960 | 2,911 |
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