Year | Value | 2021 | 25.754265645309 | 2020 | 22.271564306888 | 2019 | 17.079704407495 | 2018 | 19.630594364196 | 2017 | 29.84257778871 | 2016 | 30.698957858923 | 2015 | 9.3538397251375 | 2014 | 7.2803873036113 | 2013 | 8.7778142933262 | 2012 | 10.277904921884 | 2011 | 13.482467921851 | 2010 | 14.469656493258 | 2009 | 13.730283928841 | 2008 | 12.47582913264 | 2007 | 12.251497445948 | 2006 | 13.305210178003 | 2005 | 22.953513851394 | 2004 | 43.542106751969 | 2003 | 98.22414365733 | 2002 | 108.89743608943 | 2001 | 152.5610224693 | 2000 | 324.99687160132 | 1999 | 248.19590241287 | 1998 | 107.2848215283 | 1997 | 219.17672117297 | 1996 | 4,145.1059822064 | 1995 | 2,666.4505928854 | 1994 | 949.79253112033 | 1993 | 1,378.527607362 | 1992 | 299.50980392157 | 1991 | 83.783783783784 |
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