| Year | Value | | 2022 | 3,154 | | 2021 | 3,169 | | 2020 | 3,196 | | 2019 | 3,237 | | 2018 | 3,283 | | 2017 | 3,349 | | 2016 | 3,432 | | 2015 | 3,518 | | 2014 | 3,600 | | 2013 | 3,671 | | 2012 | 3,731 | | 2011 | 3,795 | | 2010 | 3,874 | | 2009 | 3,968 | | 2008 | 4,070 | | 2007 | 4,159 | | 2006 | 4,242 | | 2005 | 4,298 | | 2004 | 4,299 | | 2003 | 4,258 | | 2002 | 4,187 | | 2001 | 4,054 | | 2000 | 3,868 | | 1999 | 3,656 | | 1998 | 3,447 | | 1997 | 3,283 | | 1996 | 3,164 | | 1995 | 3,088 | | 1994 | 3,014 | | 1993 | 2,887 | | 1992 | 2,722 | | 1991 | 2,610 | | 1990 | 2,530 | | 1989 | 2,412 | | 1988 | 2,278 | | 1987 | 2,134 | | 1986 | 2,001 | | 1985 | 1,895 | | 1984 | 1,819 | | 1983 | 1,780 | | 1982 | 1,769 | | 1981 | 1,775 | | 1980 | 1,779 | | 1979 | 1,761 | | 1978 | 1,725 | | 1977 | 1,677 | | 1976 | 1,611 | | 1975 | 1,546 | | 1974 | 1,485 | | 1973 | 1,427 | | 1972 | 1,379 | | 1971 | 1,350 | | 1970 | 1,330 | | 1969 | 1,307 | | 1968 | 1,288 | | 1967 | 1,282 | | 1966 | 1,280 | | 1965 | 1,280 | | 1964 | 1,278 | | 1963 | 1,272 | | 1962 | 1,275 | | 1961 | 1,291 | | 1960 | 1,310 |
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