Year	% of population
2007	11.6828861274331
2008	11.7459774175346
2009	11.8128435435516
2010	11.8805189337948
2011	11.948732930818
2012	12.0174868185003
2013	12.086779893385
2014	12.1566115483386
2015	12.2269836878297