Year	% (cumulative)
1970	21.2481899261475
1975	26.2999992370605
1979	31.1000003814697
1980	31.8913097381592
1981	32.1531105041504
1990	45.2398109436035
1994	46.5410614013672
1995	30.4002952575684
1996	31.028980255127
1997	31.5116176605225
1998	32.3040504455566
1999	33.2317657470703
2000	33.7552146911621
2001	34.4499320983887
2002	35.173282623291
2003	35.7668762207031
2004	37.5299110412598
2005	36.2299385070801
2006	37.4542388916016
2007	37.8480033874512
2008	38.2589111328125
2009	38.6207695007324
2010	39.1374206542969
2011	39.944938659668
2012	40.6632308959961
2013	41.5046691894531
2014	41.8897018432617
2015	42.3375091552734
2016	43.5118789672852
2017	44.6631660461426
2018	45.167911529541
2019	46.3481178283691
2020	48.089168548584
2021	47.914421081543
2022	48.1234016418457
2023	49.1423606872559