| Year | Value | | 2021 | 390.662 | | 2020 | 5,639.574 | | 2019 | 14,850 | | 2018 | 14,387 | | 2017 | 14,372 | | 2016 | 11,933 | | 2015 | 12,983 | | 2014 | 14,732 | | 2013 | 11,897.043238617 | | 2012 | 7,432 | | 2011 | 7,191 | | 2010 | 5,104.7222222222 | | 2009 | 3,304 | | 2008 | 3,667 | | 2007 | 4,324 | | 2006 | 3,998 | | 2005 | 3,207 | | 2004 | 3,893 | | 2003 | 4,512 | | 2002 | 4,648 | | 1977 | 3,400 | | 1976 | 3,400 | | 1975 | 3,400 | | 1974 | 3,800 | | 1973 | 4,100 | | 1972 | 3,900 | | 1971 | 4,400 | | 1970 | 1,300 |
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