Year	% (cumulative)
1981	15.3000001907349
2001	35.4443511962891
2005	40.4973793029785
2006	41.4056587219238
2007	43.0896492004395
2008	43.9995613098145
2009	44.7269515991211
2010	45.5006904602051
2011	46.1607398986816
2012	47.2840003967285
2013	48.1467742919922
2014	48.6404800415039
2015	49.1525802612305
2016	50.1106872558594
2017	51.0024604797363
2018	51.9755325317383
2019	52.5768356323242
2020	52.4560317993164
2021	52.4379005432129
2022	52.7956314086914