Year	% of population
2000	6.3
2001	6.8
2002	7.5
2003	8.2
2004	8.9
2005	9.8
2006	10.7
2007	11.8
2008	12.75
2009	13.8
2010	15.3
2011	16.6
2012	17.6
2013	19.1
2014	20.2
2015	21.6
2016	22.9
2017	24.2
2018	25.9
2019	26.9
2020	28.3
2021	29.7
2022	31