Year % 2010 1.9647272829344 2011 1.486349269152 2012 1.33735163605377 2013 1.28556138254878 2014 1.45334082435894 2015 1.55169543390496 2016 1.54454922408712 2017 2.58557259811033 2018 3.57917290160729 2019 4.56492485771414 2020 6.39332297719081 2021 6.37483934737453