| Year | Value | | 2022 | 14.204717319583 | | 2021 | 3.2307491213292 | | 2020 | 1.2000734888849 | | 2019 | 0.76643957345972 | | 2018 | 1.4583129850712 | | 2017 | 1.3516188967744 | | 2016 | 0.23929078768441 | | 2015 | 0.29992047563155 | | 2014 | 0.28170503292849 | | 2013 | 2.7850005672612 | | 2012 | 3.3160556668765 | | 2011 | 3.9047542206973 | | 2010 | 1.5099752202762 | | 2009 | 0.73963396306115 | | 2008 | 8.3318966696809 | | 2007 | 2.2517579830546 | | 2006 | 3.2136292960635 | | 2005 | 0.52551595071428 | | 2004 | 0.44865020655204 | | 2003 | 0.85556212272423 | | 2002 | 2.3145979408322 | | 2001 | 5.1988852574405 | | 2000 | 6.6074229103854 | | 1999 | -1.2792865757263 | | 1998 | 0.54419965252307 | | 1997 | 1.2943648715505 | | 1996 | 2.4666000858292 | | 1995 | 16.373588972357 | | 1994 | 126.58336833625 |
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