Year	% (cumulative)
1980	19.9651107788086
1990	32.362491607666
1997	41.340446472168
2000	37.8800010681152
2001	36.1800003051758
2002	37.9500007629395
2003	38.7099990844727
2004	39.2900009155273
2005	39.310001373291
2006	39.7700004577637
2007	41.4199981689453
2008	41.6100006103516
2009	42.5999984741211
2010	45.8195495605469
2011	45.9199981689453
2013	47.5499992370605
2014	48.4700012207031
2015	48.9799995422363
2016	49.8199996948242
2017	49.3899993896484
2018	49.9000015258789
2019	51.7599983215332
2021	53.4799995422363
2022	53.4000015258789
2023	53.4131622314453