Year	% of population
2000	3.5
2001	4.1
2002	4.6
2003	5.2
2004	6.1
2005	6.8
2006	7.5
2007	8.4
2008	9.4
2009	10.4
2010	11.5
2011	12.9
2012	14.5
2013	16.1
2014	18.2
2015	20.7
2016	23.4
2017	26.9
2018	31.2
2019	35.7
2020	41.3
2021	47.2
2022	53.5