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