Year	%
1997	8.86
2002	10.64
2003	10.11
2004	11.91
2005	11.41
2006	10.93
2007	10.87
2008	11.98
2009	9.42
2010	8.07
2011	11.18
2012	10.2
2013	11.45
2014	12.09
2015	13.65
2016	13.32