Year	%
1988	4.4
1989	5.36
1990	10.15
1991	11.94
1992	11.46
1993	6.7
1994	11.11
1995	8.11
1996	7.46
1997	7.91
1998	5.79
1999	5.64
2000	5.71
2001	6.59
2002	6.33
2003	4.6
2004	5.28
2005	6.14
2006	4.67
2007	5.22
2008	4.9
2009	4.71
2010	4.24
2011	4.44
2012	4.86
2013	4.78
2014	5
2015	4.2
2016	3.96
2017	3.77