Year	%
1998	4.22
1999	4.12
2000	3.82
2001	3.56
2002	3.85
2003	3.98
2004	4.91
2005	4.63
2006	4.28
2007	4.79
2008	4.53
2009	4.79
2010	6.48
2011	5.52
2012	5.89
2013	6.49
2016	8.66