Year	%
1991	17.81
1993	8.57
1994	11.69
1995	5.01
1996	8.89
1997	9.73
1998	9.01
1999	13.24
2000	8.84
2001	9.55
2002	8.62
2003	6.5
2004	7.83
2005	8.46
2006	7.41
2007	6.78
2008	6.82
2009	6.86
2010	6.2
2011	6.3
2012	6.7
2013	6.62
2014	6.72
2015	6.95
2016	6.06
2017	6.34