Year % 2010 3.54880427143015 2011 4.15959581162895 2012 5.50187400609008 2013 4.44733135755543 2014 4.37130403366124 2015 6.83494796382143 2016 12.791174278387 2017 12.8521944714263 2018 5.0102862381755 2019 4.62787813876966 2020 4.82924273960356 2021 5.29876920745631