Year	% (cumulative)
1970	2.5422101020813
1981	4.92179012298584
1991	8.19369983673096
1998	14.4737501144409
1999	15.3392295837402
2000	15.7932395935059
2001	16.318229675293
2002	16.1941299438477
2003	17.7065696716309
2004	19.7045803070068
2005	20.4450702667236
2006	21.4909191131592
2007	21.166410446167
2008	21.7166004180908
2009	22.9562091827393
2010	24.0047092437744
2011	26.482479095459
2012	28.4411602020264
2013	30.0121593475342
2014	32.1609687805176
2015	33.9463081359863
2016	35.2512092590332
2017	35.5671005249023
2018	34.7150001525879
2019	38.8877601623535
2020	42.3444709777832
2021	45.6591835021973
2022	46.118766784668