Year	% (cumulative)
1971	54.0457992553711
1981	66.1198577880859
1991	66.6810913085938
2005	82.1544799804688
2007	83.0205993652344
2008	83.5525894165039
2009	84.1971817016602
2010	84.4569396972656
2011	84.3671875
2012	84.6652374267578
2013	84.5956497192383
2014	85.7652587890625
2015	86.0193405151367
2016	86.0288391113281
2017	85.9386367797852
2018	86.3136596679688
2019	86.2792816162109
2020	86.4138565063477
2021	86.6609191894531