Year % 2005 12.312423540933 2006 11.7157814952208 2007 12.8333897205986 2008 12.09170531708 2009 12.4929387018599 2010 12.2794464333769 2011 11.7100822807637 2012 12.1032143546041 2013 10.9455943072528 2014 11.5920383219933 2015 11.0013146061286 2016 10.7279929300049 2017 10.7199157851098 2018 10.7939209819866 2019 11.7487038778921 2020 10.5450686565039 2021 7.17980140532299 2022 8.20392470211762