Year	% (cumulative)
1971	54.6432304382324
2001	88.4369201660156
2010	83.5443420410156
2011	84.2663650512695
2013	84.7609786987305
2014	85.7876358032227
2015	85.7500381469727
2016	85.8260955810547
2017	86.6644515991211
2018	86.9789123535156
2019	87.8143768310547
2020	87.8479156494141