Year	%
1999	9.53
2001	5.91
2002	7.81
2004	5.92
2005	6.64
2006	5.49
2007	5.82
2009	6.75
2010	6.69
2011	10.87
2012	9.87
2013	10.44
2014	12.05
2015	12.11
2016	14.89
2017	14.67
2018	14.27