Year	% of population
2005	50.8585089485249
2006	49.0664772904714
2007	44.8939176791073
2008	43.7619782122171
2009	42.9584397259769
2010	42.8517497218884
2011	42.1582230765132
2012	41.0560618127524
2015	42.7237558207124
2016	42.1701283209635
2017	38.0876195438876