Year | Value | 2021 | 39,622.955 | 2020 | 39,542.556 | 2019 | 39,505.205 | 2018 | 37,367.665 | 2017 | 36,733.928 | 2016 | 36,190.3 | 2015 | 36,387.8 | 2014 | 36,638.8 | 2013 | 37,011 | 2012 | 36,644.1 | 2011 | 36,493.6 | 2010 | 36,541.7 | 2009 | 36,955.8 | 2008 | 37,258.6 | 2007 | 36,609.2 | 2006 | 37,576.6 | 2005 | 38,238.9 | 2004 | 38,696.1 | 2003 | 38,136.8 | 2002 | 38,777.2 | 2001 | 38,538.2 | 2000 | 39,563.8 | 1999 | 38,630 | 1998 | 37,225 | 1997 | 35,820 | 1996 | 37,300 | 1995 | 39,240 | 1994 | 39,520 | 1993 | 39,590 | 1992 | 38,780 | 1991 | 39,200 | 1990 | 39,630 | 1989 | 40,050 | 1988 | 40,050 | 1987 | 40,010 | 1986 | 39,970 | 1985 | 39,940 | 1984 | 39,910 | 1983 | 39,880 | 1982 | 39,850 | 1981 | 39,820 | 1980 | 39,790 | 1979 | 39,760 | 1978 | 39,710 | 1977 | 39,660 | 1976 | 39,610 | 1975 | 39,560 | 1974 | 39,510 | 1973 | 39,460 | 1972 | 39,410 | 1971 | 39,350 | 1970 | 39,290 | 1969 | 39,230 | 1968 | 39,130 | 1967 | 39,110 | 1966 | 39,050 | 1965 | 38,990 | 1964 | 38,930 | 1963 | 38,870 | 1962 | 38,810 | 1961 | 38,750 |
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