Year	% (cumulative)
1970	12.6000003814697
1980	19.761079788208
1990	30.8434200286865
1997	39.0925483703613
2000	36.5400009155273
2001	33.939998626709
2002	35.4000015258789
2003	36.1100006103516
2004	37
2005	37.4599990844727
2006	37.9599990844727
2007	39.1599998474121
2008	40.0900001525879
2009	40.9900016784668
2010	43.0041007995605
2011	43.3199996948242
2013	45.0800018310547
2014	46.0900001525879
2015	46.7700004577637
2016	47.8199996948242
2017	47.1500015258789
2018	47.1500015258789
2019	49.0200004577637
2021	51.439998626709
2022	51.2900009155273
2023	51.134162902832