Year	% of population
2005	47.755650492444
2006	46.7002017922376
2007	45.2795589640022
2008	40.3133644792023
2009	37.5989877345491
2010	35.8743062478209
2011	36.2579173630671
2012	34.5979336704479
2015	26.8287258085811
2016	29.3619157377217
2017	34.6270844741641