Year	% (cumulative)
1970	25.3425807952881
1980	45.4991188049316
2000	74.3271179199219
2005	77.743537902832
2006	77.4757385253906
2007	77.7753295898438
2008	78.6725616455078
2011	71.7788162231445
2012	71.9934005737305
2017	81.8590774536133