Year % (cumulative) 2006 0 2007 0 2008 0 2009 0 2010 0 2011 0 2012 0 2013 0 2014 16.5687789916992 2015 17.3585071563721 2016 17.484691619873 2017 17.8417663574219 2018 18.0976009368896 2019 18.1594409942627 2020 18.8079471588135 2021 18.5600147247314 2022 18.4248657226562