Year	% (cumulative)
1970	11.2852001190186
1980	18.3028106689453
1990	30.1862106323242
2000	40.0849418640137
2005	45.129810333252
2006	44.4007606506348
2007	44.4561080932617
2008	46.3404197692871
2011	47.9303283691406
2017	55.3547592163086