| Year | Value | | 2022 | 3,263 | | 2021 | 3,308 | | 2020 | 3,373 | | 2019 | 3,445 | | 2018 | 3,514 | | 2017 | 3,567 | | 2016 | 3,590 | | 2015 | 3,576 | | 2014 | 3,533 | | 2013 | 3,468 | | 2012 | 3,386 | | 2011 | 3,285 | | 2010 | 3,164 | | 2009 | 3,020 | | 2008 | 2,859 | | 2007 | 2,689 | | 2006 | 2,525 | | 2005 | 2,379 | | 2004 | 2,257 | | 2003 | 2,157 | | 2002 | 2,078 | | 2001 | 2,009 | | 2000 | 1,940 | | 1999 | 1,871 | | 1998 | 1,798 | | 1997 | 1,723 | | 1996 | 1,653 | | 1995 | 1,600 | | 1994 | 1,560 | | 1993 | 1,532 | | 1992 | 1,510 | | 1991 | 1,488 | | 1990 | 1,469 | | 1989 | 1,457 | | 1988 | 1,450 | | 1987 | 1,449 | | 1986 | 1,453 | | 1985 | 1,459 | | 1984 | 1,469 | | 1983 | 1,481 | | 1982 | 1,490 | | 1981 | 1,498 | | 1980 | 1,497 | | 1979 | 1,486 | | 1978 | 1,475 | | 1977 | 1,465 | | 1976 | 1,454 | | 1975 | 1,439 | | 1974 | 1,423 | | 1973 | 1,406 | | 1972 | 1,386 | | 1971 | 1,365 | | 1970 | 1,345 | | 1969 | 1,326 | | 1968 | 1,308 | | 1967 | 1,289 | | 1966 | 1,270 | | 1965 | 1,249 | | 1964 | 1,227 | | 1963 | 1,202 | | 1962 | 1,176 | | 1961 | 1,146 | | 1960 | 1,111 |
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