Year	% (cumulative)
1972	16.3590793609619
1981	18.8880596160889
2005	32.1631317138672
2006	44.0422401428223
2007	39.5367202758789
2008	43.9341583251953
2009	43.621150970459
2010	44.9062690734863
2011	46.4708213806152
2012	45.1287803649902
2013	45.2117118835449
2014	47.2551612854004
2015	45.4314460754395
2016	71.338493347168
2017	45.6594505310059
2018	24.0090408325195
2019	28.6737194061279
2021	48.4065818786621