Year % (cumulative) 2005 15.9559202194214 2007 15.8307600021362 2008 15.2042503356934 2009 17.3229904174805 2010 17.5195198059082 2011 17.5109405517578 2012 18.0068302154541 2013 18.6053695678711 2014 26.2802200317383 2015 26.9349098205566 2016 27.8241901397705 2017 28.4334697723389 2018 29.01047706604 2019 29.8692092895508 2020 30.1284141540527 2021 30.679235458374