Year	% of population
2000	51.0981422023709
2001	51.7904428199064
2002	52.5419955641362
2003	53.3504179262998
2004	54.2150291513885
2005	55.1317211538696
2006	56.1005772869023
2007	57.1185695757547
2008	58.183796416463
2009	59.291794552573
2010	60.4413645239922
2011	61.6296107592161
2012	62.8538882126968
2013	63.6715134756131
2014	63.9264743902707
2015	64.178599499821
2016	64.4255194323934
2017	64.6658188081877