Year Percent 2006 1.51826 2007 1.37288 2008 0.8927 2009 1.0582 2010 1.06137 2011 1.0535 2012 1.05566 2013 1.19199 2014 1.29425 2015 1.88839 2016 2.33224 2017 2.31546 2018 2.25798 2019 2.43788 2020 3.15157 2021 2.90296 2022 2.70702