Year	%
1991	11.87
1993	6.93
1994	9.82
1995	5.41
1996	7.8
1997	7.65
1998	6.36
1999	7.58
2000	5.84
2001	8.42
2002	6.73
2003	4.76
2004	6.59
2005	7.8
2006	4.73
2007	5.97
2008	6.57
2009	6.32
2010	6.02
2011	6.08
2012	6.82
2013	6.06
2014	5.97
2015	5.39
2016	4.85
2017	4.86