Year	%
1993	14.89
1994	17.02
1995	11.02
1996	25.2
1997	15.63
1998	15.43
1999	14.47
2000	11.35
2001	9.55
2002	12.69
2003	10.74
2004	9.01
2005	10.26
2006	9.15
2007	9.68
2008	32.82
2009	7.8
2010	9.2
2011	7.89
2012	8.87
2013	9.28
2014	8.21
2015	9.07
2016	7.39
2017	9.79