Year	% (cumulative)
1980	19.5616703033447
1990	29.3590202331543
1997	36.7283668518066
2000	35.1399993896484
2001	31.6599998474121
2002	32.7799987792969
2003	33.4300003051758
2004	34.5900001525879
2005	35.5200004577637
2006	36.0900001525879
2007	36.7599983215332
2008	38.439998626709
2009	39.25
2010	40.1448516845703
2011	40.4900016784668
2013	42.4000015258789
2014	43.5099983215332
2015	44.3400001525879
2016	45.6300010681152
2017	44.7299995422363
2018	44.1599998474121
2019	46
2021	49.1800003051758
2022	48.9000015258789
2023	48.6441879272461