Year	% of population
2002	1.3
2003	2.6
2004	3.9
2005	5.2
2006	14.5
2007	7.9
2008	9.3
2009	4.7
2010	6
2011	13.5
2012	14.9
2013	16.3
2014	17.2
2015	20.1
2016	22.9
2017	26
2018	28.4
2019	30.9
2020	33.4
2021	35.8
2022	37.4