Year % 2005 1.844375 2007 1.498842 2008 1.629429 2009 1.629429 2011 1.130819 2012 0.8321586 2013 0.6642339 2014 0.6496623 2015 0.7016559 2016 0.4458914 2017 1.347078 2018 0.9313915 2019 0.8838633 2020 0.6486039 2021 0.9640207