Year	%
1991	19.08
1993	8.01
1994	11.11
1995	6.74
1996	8.58
1997	9.38
1998	6.43
1999	8.19
2000	7.76
2001	8.13
2002	8.12
2003	4.93
2004	6.38
2005	7.3
2006	4.97
2007	6.26
2008	5.75
2009	5.42
2010	4.71
2011	4.78
2012	5.34
2013	5.5
2014	5.5
2015	4.22
2016	3.94
2017	3.57