Year % 2005 4.31589850311115 2006 3.58098683705457 2007 3.3213977793724 2008 3.44167340058132 2009 4.96997625418198 2010 3.48959158482402 2011 2.57632211204452 2012 2.7433675978872 2013 2.63627102630174 2014 2.74183131997442 2015 2.98772329214314 2016 3.10968373133547 2017 2.84271365893527 2018 3.68690904641214 2019 5.02294929309671 2020 3.89009244045221 2021 2.97599400811766 2022 1.97901752159553