Year	% of population
2001	18.792857130469223
2002	19.93519851582348
2003	20.840610865559547
2004	20.937129367032053
2005	20.24551303839503
2006	18.505237904362694
2007	16.698397869681433
2008	15.818059173833602
2009	15.744872833663704
2010	15.541234680652519
2011	15.358805189004933
2012	14.88693855040107
2013	14.586228849033898
2014	14.25879613841223
2015	13.805380412923121
2016	13.303373824333205
2017	12.71619226469476
2018	12.83005767479713
2019	14.025421990121178
2020	15.51976734279938
2021	16.326261071718704