Year	% (cumulative)
1981	12.6999998092651
2001	33.8268394470215
2005	38.6766014099121
2006	39.6553916931152
2007	41.6584815979004
2008	42.7378005981445
2009	43.2603988647461
2010	44.104419708252
2011	45.0158805847168
2012	46.297908782959
2013	47.1846618652344
2014	47.5720481872559
2015	48.2238311767578
2016	49.4914169311523
2017	50.3840065002441
2018	51.3599586486816
2019	52.2374305725098
2020	51.7724113464355
2021	52.2724952697754
2022	52.8150787353516