Year	%
2001	14.7
2002	14.37
2003	15.54
2004	15.27
2005	15.69
2006	16.53
2007	16.8
2008	15.97
2009	17.18
2010	15.12
2011	17.41
2012	15.47
2013	15.81
2015	16.75
2017	15.79
2018	15.12