Year	% (cumulative)
1981	27.1212692260742
1991	32.8838500976562
2001	32.7274894714355
2006	39.1283302307129
2011	43.974681854248
2012	43.3079414367676
2014	41.0733413696289
2015	39.8346214294434
2016	41.8332214355469
2017	44.0007629394531
2018	45.8481292724609
2019	46.4833679199219
2020	48.1367607116699