Year	% (cumulative)
1981	71.5999984741211
1991	81.5999984741211
2005	92.0291366577148
2006	95.554817199707
2007	93.1176681518555
2008	93.2871398925781
2010	93.3814010620117
2014	94.6889190673828
2015	95.2607803344727
2016	91.4755096435547
2017	95.5885543823242
2018	96.0224838256836
2019	96.3623352050781
2020	96.4685211181641
2021	96.8955459594727
2022	97.3204574584961