Year % (cumulative) 1986 12.6697902679443 2004 22.0340194702148 2007 27.6363906860352 2008 23.2431392669678 2009 21.5128593444824 2010 16.4486808776855 2011 18.9685192108154 2012 22.4414005279541 2013 21.6925601959229 2014 20.9473991394043 2015 18.449670791626 2016 20.1548690795898 2017 20.2374496459961 2018 21.0365219116211 2019 20.7757110595703 2020 27.8832950592041 2021 28.0536041259766 2022 30.1974792480469