Year	% (cumulative)
1976	29.1667308807373
1992	52.8932609558105
2000	50.0499992370605
2001	48.4700012207031
2002	46.6699981689453
2004	48.3300018310547
2005	51.8600006103516
2006	51.7000007629395
2007	57.6399993896484
2008	56.1399993896484
2009	57.6599998474121
2011	60.1100006103516
2012	62.9900016784668
2013	64.4400024414062
2014	60.1800003051758
2015	62.3499984741211
2016	63.5
2017	62.7400016784668
2018	64.870002746582
2019	68.2200012207031
2020	67.3000030517578
2021	69.5199966430664
2022	66.4788360595703