Year	% (cumulative)
1970	10.2529802322388
1975	12.1580495834351
1980	15.1982002258301
1990	20.5738697052002
2004	30.2273502349854
2005	30.862850189209
2006	31.2981491088867
2007	31.7412395477295
2008	32.4489212036133
2009	32.8072509765625
2010	33.368278503418
2011	34.006519317627
2012	38.3076934814453
2013	38.5578765869141
2014	35.5752601623535
2015	35.7933616638184
2016	36.3013381958008
2017	36.8592109680176
2018	39.2894287109375
2019	37.5271682739258
2020	39.2488594055176
2021	39.8116416931152
2022	39.8636589050293