Year	% (cumulative)
1970	18.1000003814697
1989	54.6899490356445
2004	78.6636276245117
2005	83.9359817504883
2006	81.1054534912109
2007	91.9989166259766
2008	91.408088684082
2014	94.7930297851562
2015	95.2514572143555