Year	%
1989	55.4
1992	57.6
1994	58.4
1996	56.9
1998	57.7
2000	58.2
2002	55.9
2004	55.6
2005	55.8
2006	55.2
2008	55.8
2010	53.2
2012	55.2
2014	54.8
2016	52.9
2018	52.1
2020	50.7
2022	49.8