Year	% of population
2005	50.5828005586486
2006	49.3276904476568
2007	47.585585412013
2008	43.2923353549888
2009	41.0896529143372
2010	39.5537703911392
2011	39.334742087465
2012	38.7530541376192
2015	31.3495918778665
2016	31.0617314743727
2017	36.200698792506