| Year | Value | | 2021 | 50,217.459 | | 2020 | 609,564.382 | | 2019 | 1,429,503.7304639 | | 2018 | 1,411,059 | | 2017 | 1,305,297 | | 2016 | 1,047,394 | | 2015 | 1,103,880 | | 2014 | 1,071,179 | | 2013 | 615,123.32800372 | | 2012 | 508,688.50938602 | | 2011 | 499,981.51796255 | | 2010 | 277,725.05429723 | | 2009 | 183,503 | | 2008 | 211,281 | | 2007 | 307,782 | | 2006 | 256,160 | | 2005 | 168,810 | | 2004 | 162,132 | | 2003 | 164,515 | | 2002 | 124,847 | | 1977 | 112,500 | | 1976 | 112,500 | | 1975 | 112,500 | | 1974 | 129,000 | | 1973 | 140,000 | | 1972 | 136,200 | | 1971 | 107,000 | | 1970 | 40,500 |
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