Year	%
1989	19.4
1992	19
1994	18.9
1996	19.5
1998	19.6
2000	19.1
2002	19.6
2004	19.6
2005	19.7
2006	19.5
2008	19.9
2010	20.4
2012	19.5
2014	19.3
2016	19.9
2018	20
2020	20.6
2022	20.7