| Year | Value | | 2022 | 4,377 | | 2021 | 4,557 | | 2020 | 4,693 | | 2019 | 4,696 | | 2018 | 4,567 | | 2017 | 4,370 | | 2016 | 4,163 | | 2015 | 4,014 | | 2014 | 3,976 | | 2013 | 4,066 | | 2012 | 4,257 | | 2011 | 4,514 | | 2010 | 4,578 | | 2009 | 4,375 | | 2008 | 4,088 | | 2007 | 3,753 | | 2006 | 3,406 | | 2005 | 3,071 | | 2004 | 2,765 | | 2003 | 2,501 | | 2002 | 2,284 | | 2001 | 2,112 | | 2000 | 1,980 | | 1999 | 1,898 | | 1998 | 1,851 | | 1997 | 1,807 | | 1996 | 1,766 | | 1995 | 1,725 | | 1994 | 1,683 | | 1993 | 1,639 | | 1992 | 1,595 | | 1991 | 1,551 | | 1990 | 1,512 | | 1989 | 1,475 | | 1988 | 1,441 | | 1987 | 1,409 | | 1986 | 1,377 | | 1985 | 1,341 | | 1984 | 1,301 | | 1983 | 1,255 | | 1982 | 1,194 | | 1981 | 1,127 | | 1980 | 1,075 | | 1979 | 1,050 | | 1978 | 1,048 | | 1977 | 1,057 | | 1976 | 1,087 | | 1975 | 1,132 | | 1974 | 1,176 | | 1973 | 1,222 | | 1972 | 1,268 | | 1971 | 1,314 | | 1970 | 1,359 | | 1969 | 1,394 | | 1968 | 1,402 | | 1967 | 1,392 | | 1966 | 1,382 | | 1965 | 1,369 | | 1964 | 1,354 | | 1963 | 1,336 | | 1962 | 1,316 | | 1961 | 1,295 | | 1960 | 1,274 |
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