Year | Value | 2021 | 35.15498736 | 2020 | 27.90528061 | 2019 | 22.92009029 | 2018 | 15.7 | 2017 | 14.8 | 2016 | 13.8 | 2015 | 6.1 | 2014 | 3.32 | 2013 | 3.1 | 2012 | 2.893990621 | 2011 | 2.672 | 2010 | 2.45 | 2009 | 2.303280592 | 2008 | 2.354888711 | 2007 | 2.206302237 | 2006 | 2.057196705 | 2005 | 1.901365316 | 2004 | 1.808142203 | 2003 | 1.354197478 | 2002 | 1.022993234 | 2001 | 0.299569145 | 2000 | 0.230103171 | 1999 | 0.117702448 | 1998 | 0.024060421 | 1997 | 0.016389063 |
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