Year	% of population
2008	22.440415499964
2009	19.5961364300665
2010	23.2163339646719
2011	20.2294860958326
2012	25.0432828639295
2013	24.6327011469305
2014	28.3956683352025
2015	30.5583521561949
2016	33.3801019786847
2017	35.0795470169923
2018	29.4504429649815
2019	32.5789970976157