Year	%
1995	16.48
1997	16.48
2001	17.18
2002	17
2003	16.96
2004	16.71
2005	17.51
2006	17.52
2007	16.56
2008	16.72
2009	16.84
2010	16.87
2011	16.78
2013	17.16
2015	17
2016	17.94