Year	%
1989	50.1
1992	52.3
1994	53.4
1996	52
1998	53.3
2000	53.4
2002	50.6
2004	50.3
2005	50.9
2006	49.7
2008	50.8
2010	47.7
2012	49.6
2014	48.9
2016	46.9
2018	46
2020	44.6
2022	43.5