Year	% of population
1981	56.4
1982	55.7
1983	54.5
1984	53.8
1985	53.2
1986	52.8
1987	52.7
1988	52.1
1989	51.9
1990	51.7
1991	51
1992	50.3
1993	50.2
1994	49.7
1995	49.3
1996	48.6
2002	47.1
2003	46.4
2004	45.3
2005	44.3
2006	43.4
2007	42.4
2008	41.7
2009	40.7
2010	39.2
2011	37.8
2012	37
2013	36.3
2014	35.8
2015	35.2
2016	34.8
2017	33.6
2018	32.3
2019	32.5
2020	33.5
2021	32.7
2022	31.9