Year	% (cumulative)
1972	34.0000190734863
1981	50.6454887390137
2000	56.9500007629395
2001	58.1300010681152
2002	60.0999984741211
2003	57.8499984741211
2004	60.6699981689453
2005	61
2006	62.8400001525879
2007	65.2600021362305
2008	65.5199966430664
2009	65.6900024414062
2010	65.9800033569336
2011	66.0800018310547
2012	67.5800018310547
2013	67.620002746582
2014	68.5500030517578
2015	69.879997253418
2016	69.9599990844727
2017	70.3499984741211
2018	70.9899978637695
2019	71.9100036621094
2020	73.3899993896484
2021	73.4000015258789
2022	74.8899993896484