Year % of population 1996 30.1 2001 33.4 2002 31.2 2003 29.5 2004 26.1 2005 31.9 2006 18 2007 16.8 2008 14.8 2009 15.3 2010 14 2011 12.9 2012 13.6 2013 11.3 2014 11.2 2015 11.2 2016 12.8 2017 11.7 2018 10.1 2019 10.2 2020 9.5 2021 8.3