Year | Value | 2021 | 51,830.626614575 | 2020 | 45,322.007069857 | 2019 | 44,558.122934065 | 2018 | 46,269.208666644 | 2017 | 45,639.940561735 | 2016 | 43,610.186697005 | 2015 | 43,373.545425611 | 2014 | 51,104.430765247 | 2013 | 52,089.635275941 | 2012 | 49,429.392369919 | 2011 | 51,652.818109281 | 2010 | 45,188.855529741 | 2009 | 39,718.794797179 | 2008 | 48,848.586775592 | 2007 | 46,849.537313772 | 2006 | 40,452.409664297 | 2005 | 37,127.980381787 | 2004 | 36,331.384743704 | 2003 | 31,984.25532137 | 2002 | 25,085.752411422 | 2001 | 22,859.305628275 | 2000 | 25,025.380673076 | 1999 | 26,206.538540744 | 1998 | 25,552.046732453 | 1997 | 25,246.40711205 | 1996 | 27,555.750884238 | 1995 | 25,357.171908753 | 1994 | 21,623.408110878 | 1993 | 19,711.194006765 | 1992 | 26,897.011803852 | 1991 | 26,549.294041137 | 1990 | 25,680.58258491 | 1989 | 21,697.038439043 | 1988 | 20,852.660619198 | 1987 | 18,595.279961538 | 1986 | 15,273.826060293 | 1985 | 11,509.613443748 | 1984 | 11,050.520770038 | 1983 | 10,583.844633165 | 1982 | 11,593.4286091 | 1981 | 13,275.500183253 | 1980 | 14,680.603383413 | 1979 | 12,757.26197957 | 1978 | 10,825.374688421 | 1977 | 9,859.6745439922 | 1976 | 9,468.3259567785 | 1975 | 8,849.7087651933 | 1974 | 7,050.9449733789 | 1973 | 6,413.2051342139 | 1972 | 5,296.0444986603 | 1971 | 4,508.9684762405 | 1970 | 4,162.1139133777 |
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