Year	% of population
1984	63.1
1985	60.2
1986	57.7
1987	55.1
1988	51.1
1989	57.6
1990	56.5
1991	55.2
1992	53.3
1993	51.4
1994	48
1995	45.9
1996	44.3
1997	44.4
1998	45.3
1999	43.5
2000	42.2
2001	41.1
2002	39.4
2003	37.9
2004	36.5
2005	35
2006	34.4
2007	33.6
2008	33.1
2009	32.3
2010	31.3
2011	29.8
2012	29.1
2013	26.7
2014	26.1
2015	25.1
2016	24.9
2017	24.7
2018	24
2019	23.4
2020	22.3
2021	21.9
2022	21.4