Year	% of population
2007	3
2008	1.3
2009	1.9
2010	5.3
2011	4.1
2012	9.3
2013	9.8
2014	9.4
2015	15.2
2016	17.7
2017	24.2
2018	22.8
2019	23.1
2020	27.6
2021	29.8
2022	31.8