Year Number 1996 26.0638294219971 1998 19.680850982666 2000 5.29100513458252 2002 0 2003 1.00502514839172 2004 0.485436886548996 2005 0 2006 0.483091801404953 2007 2.4154589176178 2008 1.92307686805725 2009 6.16113758087158 2010 3.79146909713745 2011 4.7393364906311 2012 6.16113758087158 2013 7.5829381942749 2014 8.09523773193359 2015 10.4761905670166 2016 10.9523811340332 2017 8.5714282989502 2018 11.3207550048828 2019 8.96226406097412 2020 10.3773584365845 2021 13.2075471878052 2022 16.0377349853516