Year	% of population
2000	12.6
2001	10.9
2002	9
2003	7.6
2004	6.8
2005	6.6
2006	6.8
2007	7.1
2008	7.6
2009	7.9
2010	8.2
2011	8.6
2012	9.5
2013	10.4
2014	11.2
2015	11.6
2016	11.8
2017	12.2