Year	%
1993	18.05
1994	21.78
1995	15.2
1996	24.03
1997	20.18
1998	17.13
1999	20.09
2000	13.41
2001	12.94
2002	13.68
2003	12.88
2004	11.07
2005	13.87
2006	13.18
2007	13.08
2008	13.37
2009	12.14
2010	12.78
2011	12.32
2012	12.16
2013	11.55
2014	11.16
2015	12.09
2016	10.87
2017	10.96