Year	% (cumulative)
1981	5.49604988098145
2001	17.1284294128418
2011	24.1828193664551
2012	24.678840637207
2013	22.1853504180908
2014	23.2181606292725
2015	28.5621795654297
2016	28.9691696166992
2017	29.7941703796387
2018	30.5447692871094
2019	31.330099105835
2021	33.6561393737793