| Year | Value | | 2022 | 5,510 | | 2021 | 5,600 | | 2020 | 5,683 | | 2019 | 5,775 | | 2018 | 5,857 | | 2017 | 5,902 | | 2016 | 5,892 | | 2015 | 5,828 | | 2014 | 5,736 | | 2013 | 5,634 | | 2012 | 5,531 | | 2011 | 5,449 | | 2010 | 5,392 | | 2009 | 5,338 | | 2008 | 5,277 | | 2007 | 5,205 | | 2006 | 5,112 | | 2005 | 5,005 | | 2004 | 4,901 | | 2003 | 4,795 | | 2002 | 4,687 | | 2001 | 4,554 | | 2000 | 4,392 | | 1999 | 4,221 | | 1998 | 4,047 | | 1997 | 3,878 | | 1996 | 3,713 | | 1995 | 3,556 | | 1994 | 3,413 | | 1993 | 3,288 | | 1992 | 3,175 | | 1991 | 3,089 | | 1990 | 3,033 | | 1989 | 3,005 | | 1988 | 3,017 | | 1987 | 3,053 | | 1986 | 3,077 | | 1985 | 3,076 | | 1984 | 3,077 | | 1983 | 3,088 | | 1982 | 3,101 | | 1981 | 3,108 | | 1980 | 3,101 | | 1979 | 3,076 | | 1978 | 3,044 | | 1977 | 3,013 | | 1976 | 2,925 | | 1975 | 2,813 | | 1974 | 2,774 | | 1973 | 2,812 | | 1972 | 2,859 | | 1971 | 2,862 | | 1970 | 2,818 | | 1969 | 2,743 | | 1968 | 2,655 | | 1967 | 2,566 | | 1966 | 2,495 | | 1965 | 2,437 | | 1964 | 2,382 | | 1963 | 2,329 | | 1962 | 2,278 | | 1961 | 2,233 | | 1960 | 2,187 |
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