| Year | Value | | 2021 | 50,640.42538998 | | 2020 | 41,951.629809596 | | 2019 | 57,209.218648863 | | 2018 | 56,121.905134834 | | 2017 | 52,085.087796357 | | 2016 | 45,924.661101447 | | 2015 | 43,350.259807037 | | 2014 | 41,678.07988041 | | 2013 | 38,876.418498691 | | 2012 | 37,115.000072243 | | 2011 | 37,816.481855166 | | 2010 | 37,918.229053258 | | 2009 | 30,328.171 | | 2008 | 28,168.689 | | 2007 | 26,849.244 | | 2006 | 23,939.96 | | 2005 | 22,872.717 | | 2004 | 22,021.754 | | 2003 | 18,715.764 | | 2002 | 17,379.644 | | 2001 | 16,415.517 | | 2000 | 16,844.393 | | 1999 | 14,921.399901167 | | 1998 | 13,948.499873705 | | 1997 | 14,259.400111407 | | 1996 | 12,575.499991029 | | 1995 | 12,265.200081408 | | 1994 | 11,634.399903223 | | 1993 | 10,255.500065893 | | 1992 | 8,780.4000887789 | | 1991 | 7,983.2999383807 | | 1990 | 7,780.7000606207 | | 1989 | 7,447.200022839 | | 1988 | 7,289.6999798043 | | 1987 | 6,790.5000272021 | | 1986 | 5,951.8000520471 | | 1985 | 5,706.6000322626 | | 1984 | 5,774.1000516568 | | 1983 | 5,129.8999600556 | | 1982 | 4,704.6000336558 | | 1981 | 4,405.2000069319 | | 1980 | 3,953.7999748511 | | 1979 | 3,631.7000315786 | | 1978 | 3,383.9000013248 | | 1977 | 3,015.1999889913 | | 1976 | 2,769.5000304136 | | 1975 | 2,364.6999953393 | | 1974 | 2,039.099996306 |
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