| Year | Value | | 2022 | 6,417 | | 2021 | 6,427 | | 2020 | 6,477 | | 2019 | 6,435 | | 2018 | 6,245 | | 2017 | 5,930 | | 2016 | 5,587 | | 2015 | 5,284 | | 2014 | 5,038 | | 2013 | 4,932 | | 2012 | 4,991 | | 2011 | 5,173 | | 2010 | 5,397 | | 2009 | 5,568 | | 2008 | 5,585 | | 2007 | 5,396 | | 2006 | 5,036 | | 2005 | 4,588 | | 2004 | 4,154 | | 2003 | 3,913 | | 2002 | 4,039 | | 2001 | 4,321 | | 2000 | 4,447 | | 1999 | 4,369 | | 1998 | 4,226 | | 1997 | 4,122 | | 1996 | 4,023 | | 1995 | 3,929 | | 1994 | 3,842 | | 1993 | 3,761 | | 1992 | 3,687 | | 1991 | 3,606 | | 1990 | 3,528 | | 1989 | 3,477 | | 1988 | 3,444 | | 1987 | 3,415 | | 1986 | 3,386 | | 1985 | 3,352 | | 1984 | 3,312 | | 1983 | 3,264 | | 1982 | 3,206 | | 1981 | 3,157 | | 1980 | 3,108 | | 1979 | 3,017 | | 1978 | 2,890 | | 1977 | 2,759 | | 1976 | 2,630 | | 1975 | 2,505 | | 1974 | 2,380 | | 1973 | 2,255 | | 1972 | 2,135 | | 1971 | 2,023 | | 1970 | 1,924 | | 1969 | 1,838 | | 1968 | 1,763 | | 1967 | 1,707 | | 1966 | 1,660 | | 1965 | 1,608 | | 1964 | 1,559 | | 1963 | 1,514 | | 1962 | 1,471 | | 1961 | 1,433 | | 1960 | 1,394 |
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