Year Number 2008 32.5242729187012 2009 36.8421058654785 2010 22.9665069580078 2011 33.1753540039063 2012 34.5971565246582 2013 34.1232223510742 2014 29.8076915740967 2015 58.5714302062988 2016 61.4285697937012 2017 62.8571434020996 2018 61.4285697937012 2019 61.9047622680664 2020 66.1904754638672 2021 65.7142868041992 2022 67.4528274536133