Year	% (cumulative)
1991	53.3252296447754
2001	71.0977783203125
2006	73.2182312011719
2011	70.5523910522461
2012	70.8734130859375
2014	72.0807037353516
2015	72.0022735595703
2016	71.8930587768555
2017	73.9421691894531
2018	75.3207015991211
2019	74.888298034668
2020	75.6891021728516