Year	% (cumulative)
1976	28.5
1981	34.7065315246582
1990	33.2574272155762
1991	33.872688293457
1992	34.8979072570801
1993	36.611701965332
1994	39.2961502075195
1995	40.2457122802734
1996	41.2341194152832
1997	43.3717041015625
1998	44.2089233398438
1999	45.1914596557617
2000	45.669246673584
2001	47.3349533081055
2002	48.3539695739746
2003	49.4734764099121
2004	50.5389633178711
2005	52.1681365966797
2006	54.1988410949707
2007	54.3033332824707
2008	55.1084060668945
2009	55.5136642456055
2010	56.971076965332
2011	58.6228408813477
2012	58.957878112793
2013	59.704402923584
2014	59.918628692627
2015	61.0300941467285
2016	60.4305305480957
2017	62.8986206054688
2018	63.9691734313965
2019	65.1168518066406
2020	66.1474227905273
2021	62.920539855957
2022	68.6005935668945
2023	69.2165908813477