Year	%
1985	21.5
1986	22.9
1987	24.2
1988	23.8
1989	26
1990	22.8
1991	22.1
1992	22.2
1993	22.1
1994	22.7
1995	22.8
1996	23.1
1997	23.5
1998	24.1
1999	23.8
2000	23.7
2001	24.6
2002	25
2003	23.7
2004	23.7
2005	24.3
2006	24.3
2007	25.1
2008	25.8
2009	24.2
2010	23.7
2011	24.4
2012	26.4
2013	24.2
2014	24.3
2015	25.1
2016	24.1
2017	25.6
2018	26.6
2019	25.8
2020	25
2021	24.6