| Year | Value | | 2022 | 5,287 | | 2021 | 5,222 | | 2020 | 5,142 | | 2019 | 5,047 | | 2018 | 4,933 | | 2017 | 4,800 | | 2016 | 4,644 | | 2015 | 4,469 | | 2014 | 4,309 | | 2013 | 4,156 | | 2012 | 3,993 | | 2011 | 3,846 | | 2010 | 3,691 | | 2009 | 3,517 | | 2008 | 3,373 | | 2007 | 3,275 | | 2006 | 3,206 | | 2005 | 3,191 | | 2004 | 3,227 | | 2003 | 3,293 | | 2002 | 3,375 | | 2001 | 3,451 | | 2000 | 3,504 | | 1999 | 3,518 | | 1998 | 3,484 | | 1997 | 3,411 | | 1996 | 3,320 | | 1995 | 3,223 | | 1994 | 3,133 | | 1993 | 3,054 | | 1992 | 2,976 | | 1991 | 2,886 | | 1990 | 2,767 | | 1989 | 2,636 | | 1988 | 2,519 | | 1987 | 2,417 | | 1986 | 2,334 | | 1985 | 2,261 | | 1984 | 2,192 | | 1983 | 2,111 | | 1982 | 2,016 | | 1981 | 1,911 | | 1980 | 1,811 | | 1979 | 1,714 | | 1978 | 1,664 | | 1977 | 1,668 | | 1976 | 1,683 | | 1975 | 1,711 | | 1974 | 1,744 | | 1973 | 1,758 | | 1972 | 1,734 | | 1971 | 1,691 | | 1970 | 1,647 | | 1969 | 1,613 | | 1968 | 1,598 | | 1967 | 1,598 | | 1966 | 1,599 | | 1965 | 1,592 | | 1964 | 1,574 | | 1963 | 1,555 | | 1962 | 1,535 | | 1961 | 1,510 | | 1960 | 1,483 |
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