Year | Value | 2021 | 49,607.175415327 | 2020 | 39,973.740210301 | 2019 | 42,297.147915177 | 2018 | 41,648.300449045 | 2017 | 38,093.97481627 | 2016 | 35,982.577774158 | 2015 | 34,222.829916134 | 2014 | 38,740.091700845 | 2013 | 35,850.357054952 | 2012 | 32,552.740140692 | 2011 | 35,191.623131059 | 2010 | 33,922.998082657 | 2009 | 36,126.139408819 | 2008 | 44,667.299208616 | 2007 | 44,491.233810051 | 2006 | 39,722.04914536 | 2005 | 37,328.640323676 | 2004 | 35,219.20817882 | 2003 | 30,561.340894614 | 2002 | 23,657.050781411 | 2001 | 20,897.799557381 | 2000 | 19,929.949526715 | 1999 | 19,985.81201682 | 1998 | 19,104.261022725 | 1997 | 17,871.612898187 | 1996 | 16,767.881432679 | 1995 | 15,304.226437201 | 1994 | 12,930.856230279 | 1993 | 11,914.630726425 | 1992 | 12,710.589392089 | 1991 | 11,546.710311256 | 1990 | 11,511.731737401 | 1989 | 9,050.6724860488 | 1988 | 8,807.2705122996 | 1987 | 7,958.2806131212 | 1986 | 6,735.0497072362 | 1985 | 4,943.8469696516 | 1984 | 4,740.2346532536 | 1983 | 5,012.1167468101 | 1982 | 5,301.8252631221 | 1981 | 5,302.5275134308 | 1980 | 5,625.1799105691 | 1979 | 4,862.0161709196 | 1978 | 3,975.9034134837 | 1977 | 3,185.6288241095 | 1976 | 2,759.3304827755 | 1975 | 2,852.4103175476 | 1974 | 2,393.7707540394 | 1973 | 2,324.6366754864 | 1972 | 2,015.1180341785 | 1971 | 1,649.9470313662 | 1970 | 1,443.5987973723 |
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