Year % (cumulative) 2006 99.3701019287109 2007 99.3049850463867 2008 99.3339996337891 2009 99.845703125 2010 99.8763275146484 2011 99.8957824707031 2012 99.8613586425781 2013 99.8679809570312 2014 99.9261779785156 2015 99.0572967529297 2016 98.7497482299805 2017 100 2018 98.7639923095703 2019 98.6926803588867 2020 100 2021 100