Year | Value | 2021 | 31,457.711515009 | 2020 | 27,865.609783639 | 2019 | 28,975.588333014 | 2018 | 29,635.097533443 | 2017 | 27,373.349507732 | 2016 | 25,764.675762527 | 2015 | 25,112.446479111 | 2014 | 29,200.263609606 | 2013 | 28,581.238943573 | 2012 | 27,395.332286924 | 2011 | 29,591.346438122 | 2010 | 27,268.155203997 | 2009 | 27,620.790552851 | 2008 | 30,687.61713915 | 2007 | 28,090.576125071 | 2006 | 24,423.634806018 | 2005 | 22,904.21296931 | 2004 | 22,019.606779426 | 2003 | 19,149.516782441 | 2002 | 15,640.465669132 | 2001 | 14,423.498283999 | 2000 | 14,275.461238411 | 1999 | 15,626.946117675 | 1998 | 15,711.51475142 | 1997 | 15,268.074449486 | 1996 | 16,679.343592754 | 1995 | 16,420.682861151 | 1994 | 14,158.518810055 | 1993 | 13,386.969171845 | 1992 | 14,790.55857399 | 1991 | 13,515.825371959 | 1990 | 13,124.93358482 | 1989 | 10,548.4483481 | 1988 | 10,372.599169769 | 1987 | 9,463.9262514118 | 1986 | 7,652.6821865508 | 1985 | 5,444.18794186 | 1984 | 5,297.640769754 | 1983 | 5,504.3226769841 | 1982 | 5,667.5021920211 | 1981 | 5,934.4230776919 | 1980 | 6,915.3036552289 | 1979 | 6,253.1480559615 | 1978 | 5,205.2917057862 | 1977 | 4,282.8434091227 | 1976 | 3,810.1948029527 | 1975 | 3,655.8928103393 | 1974 | 3,173.2229952374 | 1973 | 2,848.6574348327 | 1972 | 2,214.5972535265 | 1971 | 1,848.6808054596 | 1970 | 1,648.2232048601 |
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