Year	%
1993	19.63
1994	17.1
1995	15.11
1996	20.91
1997	18.02
1998	15.94
1999	15.38
2000	12.72
2001	12.45
2002	13.12
2003	13.05
2004	11.33
2005	13.75
2006	12.49
2007	12.45
2008	12.8
2009	12.56
2010	12.48
2011	12.38
2012	11.55
2013	12.04
2014	11.52
2015	12.65
2016	11.96
2017	12.13