Year	% (cumulative)
1976	33.4095687866211
1981	35.9088706970215
1990	39.0864334106445
1991	39.1892127990723
1992	40.3117904663086
1993	41.6272811889648
1994	43.9662132263184
1995	45.05224609375
1996	45.5865364074707
1997	48.0610122680664
1998	48.6547241210938
1999	49.2166481018066
2000	49.5372772216797
2001	50.9918327331543
2002	51.772274017334
2003	52.9939117431641
2004	53.255558013916
2005	54.4756317138672
2006	57.9041900634766
2007	56.201774597168
2008	56.4278373718262
2009	56.9492874145508
2010	57.6925506591797
2011	60.7312202453613
2012	58.9513664245605
2013	59.1701240539551
2014	59.773494720459
2015	60.7279624938965
2016	60.3970184326172
2017	61.6309547424316
2018	62.381462097168
2019	63.9759216308594
2020	64.4706802368164
2021	61.4580192565918
2022	65.8976440429688
2023	66.8202056884766