Year	%
1992	13.4
1993	13.3
1995	10.8
1996	12
2002	13.3
2003	13.4
2004	13.4
2005	13.3
2006	13.1
2007	13.8
2008	13.9
2009	14.2
2010	14.3
2011	14.4
2012	14.3
2013	14.5
2014	14.6
2015	14.3
2016	14.4
2017	14
2018	14.1
2019	14
2020	14.3