Year	% of population
1984	49.2
1985	47.9
1986	46.8
1987	45.8
1988	44.2
1989	46.7
1990	46.4
1991	45.9
1992	45.1
1993	44.6
1994	43.2
1995	42.2
1996	41.4
1997	41.1
1998	41.4
1999	40.8
2000	40.2
2001	39.6
2002	38.9
2003	38.1
2004	37.1
2005	36.1
2006	35.5
2007	34.8
2008	34.4
2009	33.7
2010	32.7
2011	31.6
2012	31.1
2013	29.9
2014	29.5
2015	29
2016	28.9
2017	28.4
2018	27.7
2019	27.6
2020	27.6
2021	27.2
2022	26.7