Year	% (cumulative)
1970	15.3000001907349
1989	54.2727508544922
2004	80.0165405273438
2005	84.4936676025391
2006	81.7704315185547
2007	91.4906463623047
2008	91.0210113525391
2014	94.3069305419922
2015	96.2681427001953