Year | Value | 2021 | 58,796.359932369 | 2020 | 52,242.031367984 | 2019 | 50,967.611502407 | 2018 | 52,836.996120899 | 2017 | 49,220.803913477 | 2016 | 46,794.911369213 | 2015 | 45,798.029802319 | 2014 | 53,755.909092581 | 2013 | 51,939.826362982 | 2012 | 48,806.803024405 | 2011 | 51,361.501816259 | 2010 | 48,113.336016504 | 2009 | 47,573.967054705 | 2008 | 52,156.641171729 | 2007 | 47,977.500688618 | 2006 | 43,212.556172738 | 2005 | 40,233.264446459 | 2004 | 38,020.619375128 | 2003 | 32,685.851982715 | 2002 | 26,835.896650873 | 2001 | 24,860.188283658 | 2000 | 24,662.629235981 | 1999 | 27,386.23327144 | 1998 | 27,333.075749977 | 1997 | 26,692.15785731 | 1996 | 29,008.818889322 | 1995 | 28,791.977405059 | 1994 | 24,288.285225408 | 1993 | 22,174.203832388 | 1992 | 23,726.497062695 | 1991 | 21,534.669467463 | 1990 | 21,548.462898743 | 1989 | 17,635.342793132 | 1988 | 18,362.947032983 | 1987 | 17,586.31276231 | 1986 | 14,186.014508754 | 1985 | 9,981.5082708688 | 1984 | 9,426.9785566707 | 1983 | 9,686.2521992214 | 1982 | 9,623.6322050199 | 1981 | 9,899.9561829582 | 1980 | 11,625.307414471 | 1979 | 11,791.965105768 | 1978 | 10,249.318595234 | 1977 | 8,443.3850543541 | 1976 | 7,554.9414064074 | 1975 | 6,809.614872649 | 1974 | 5,744.7624135952 | 1973 | 5,290.0657543958 | 1972 | 3,942.8283331841 | 1971 | 3,252.1398490356 | 1970 | 2,941.1384690338 |
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