Year % 2008 4.21574658021237 2009 5.79123054219476 2010 8.21418388709017 2011 11.814021388063 2012 15.1800772229366 2013 13.3118940728928 2014 11.7319347333409 2015 9.96211515631996 2016 5.07141393661737 2017 3.20363588164704 2018 6.00921749143582 2019 3.364772691154 2020 3.01762967051172 2021 2.0551823830108 2022 1.75022880209529