Year | Value | 2021 | 30,029.1 | 2020 | 30,055.4 | 2019 | 30,047.8 | 2018 | 30,003.9 | 2017 | 30,113.7 | 2016 | 30,209.2 | 2015 | 30,283.5 | 2014 | 30,360.7 | 2013 | 30,360.8 | 2012 | 30,315 | 2011 | 30,631 | 2010 | 30,737 | 2009 | 30,672 | 2008 | 30,758 | 2007 | 31,209 | 2006 | 31,501 | 2005 | 32,012 | 2004 | 31,532 | 2003 | 31,287 | 2002 | 31,399 | 2001 | 30,539 | 2000 | 29,741 | 1999 | 31,940 | 1998 | 32,310 | 1997 | 32,590 | 1996 | 32,970 | 1995 | 32,670 | 1994 | 33,560 | 1993 | 33,560 | 1992 | 33,440 | 1991 | 33,580 | 1990 | 34,130 | 1989 | 34,180 | 1988 | 34,370 | 1987 | 34,550 | 1986 | 34,760 | 1985 | 34,940 | 1984 | 36,110 | 1983 | 36,360 | 1982 | 36,600 | 1981 | 36,750 | 1980 | 37,040 | 1979 | 37,110 | 1978 | 37,280 | 1977 | 37,220 | 1976 | 37,350 | 1975 | 37,260 | 1974 | 37,350 | 1973 | 37,180 | 1972 | 37,340 | 1971 | 37,580 | 1970 | 37,530 | 1969 | 37,450 | 1968 | 37,210 | 1967 | 37,850 | 1966 | 37,970 | 1965 | 38,490 | 1964 | 39,430 | 1963 | 39,810 | 1962 | 41,720 | 1961 | 42,370 |
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