Year % 2006 2.88924830799956 2007 3.20083686790681 2008 7.27535879705032 2009 13.5504391510384 2010 20.9294667304236 2011 15.2910548471522 2012 17.3025070519201 2013 20.3084823035393 2014 18.586564885194 2015 14.5783594660382 2016 11.354372633992 2017 8.29218459497308 2018 7.35692267453808 2019 5.09127517723506 2020 5.86672519968626 2021 6.82517015780468 2022 6.32770344904808