Year	% of population
2003	7.6
2004	6.6
2005	7.6
2006	7.7
2007	7.3
2008	8.1
2009	7.9
2010	7.9
2011	8.5
2012	8.4
2013	6.6
2014	7.6
2015	7.2
2016	7.8
2017	7.1