Year	% of population
2006	20.657331339971
2007	20.1672709531394
2008	17.5800143290538
2009	18.7945480660888
2011	16.5458598262687
2012	16.2254394314212
2014	16.440232249574
2015	15.7159740232602
2016	15.748008798031
2017	14.9845854843057
2018	16.4238389565803
2019	19.2382932645534
2020	20.9282108410251