Year	% (cumulative)
1970	28.8864593505859
1980	47.3579788208008
2000	74.5624771118164
2005	77.2205581665039
2006	75.9843521118164
2007	76.778938293457
2008	76.5963516235352
2011	67.4688110351562
2012	67.5410385131836
2017	77.7481002807617