Year	%
1999	8.56
2001	5.45
2002	7.25
2004	5.45
2005	6.2
2006	5.1
2007	5.3
2009	6.22
2010	6.16
2011	10.08
2012	9.19
2013	9.81
2014	11.26
2015	11.39
2016	13.93
2017	13.84
2018	13.45