Year	% (cumulative)
1970	27.0453605651855
1980	46.3688316345215
2000	74.4360504150391
2005	77.5027465820312
2006	76.7839279174805
2007	77.3127593994141
2008	77.7096862792969
2011	69.782341003418
2012	69.9321365356445
2017	80.0156402587891