Year	% (cumulative)
1975	3.91026997566223
1992	15.1876096725464
2001	19.4696998596191
2006	21.9722595214844
2007	22.224100112915
2008	22.6010494232178
2009	23.1817893981934
2010	23.633279800415
2011	23.6131000518799
2012	24.6025695800781
2013	26.2239608764648
2014	27.6302509307861
2015	28.1908798217773
2016	28.3303508758545
2017	28.4752101898193
2018	29.2355575561523
2019	29.3248825073242
2020	29.6164703369141
2021	30.1665000915527
2022	30.5550937652588