Year | Value | 2021 | 42,982.481891127 | 2020 | 39,043.097150167 | 2019 | 39,718.002334251 | 2018 | 40,854.555971618 | 2017 | 37,760.339676228 | 2016 | 35,663.678892964 | 2015 | 34,656.44190575 | 2014 | 40,356.483120037 | 2013 | 38,946.313067058 | 2012 | 36,959.968934596 | 2011 | 39,563.817332896 | 2010 | 34,884.034791912 | 2009 | 34,858.124861143 | 2008 | 38,083.934775277 | 2007 | 35,163.313925345 | 2006 | 30,794.461706335 | 2005 | 28,850.872771564 | 2004 | 28,464.029572208 | 2003 | 24,783.896385462 | 2002 | 20,609.381554829 | 2001 | 19,447.035694408 | 2000 | 19,549.441842455 | 1999 | 22,110.417098505 | 1998 | 22,615.009379793 | 1997 | 22,429.162330276 | 1996 | 25,446.259511175 | 1995 | 26,435.10328738 | 1994 | 22,642.909631657 | 1993 | 21,371.874058805 | 1992 | 22,313.229962435 | 1991 | 19,773.307338522 | 1990 | 19,019.043191209 | 1989 | 15,136.427888333 | 1988 | 15,243.036933967 | 1987 | 14,069.971742065 | 1986 | 11,388.827016318 | 1985 | 7,966.9537276519 | 1984 | 7,863.416325591 | 1983 | 8,295.5903872183 | 1982 | 8,303.4805222789 | 1981 | 8,598.9290386286 | 1980 | 10,333.02427025 | 1979 | 9,669.4622345361 | 1978 | 8,167.8245868543 | 1977 | 6,596.7387436723 | 1976 | 5,702.2100210669 | 1975 | 5,344.0497042017 | 1974 | 4,865.5957126261 | 1973 | 4,387.974388133 | 1972 | 3,309.8817827226 | 1971 | 2,781.0343246569 | 1970 | 2,420.1534474966 |
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