Year	% of population
2000	53.2
2001	53.3
2002	52.6
2003	52.4
2004	51.6
2005	51.6
2006	50.3
2007	49.8
2008	49.15
2009	47.45
2010	46.7
2011	45.3
2012	44.1
2013	43.45
2014	40.7
2015	40
2016	39.1
2017	36.5
2018	34.8
2019	33.4
2020	33.2
2021	31.2
2022	29.45