Year	% (cumulative)
1970	20.6134700775146
1975	25.1352005004883
1980	31.614330291748
1990	44.4221115112305
2000	50.3525085449219
2004	64.7785263061523
2008	65.9266128540039
2010	67.6706008911133
2013	71.1073684692383
2017	62.025260925293
2019	73.3515701293945
2020	65.7818832397461
2021	64.7939682006836
2022	63.6305389404297