Year	Percent
2002	8.0881
2003	8.1309
2004	7.2871
2005	8.9619
2006	6.8905
2007	6.9765
2008	6.2129
2009	5.9916
2010	7.1572
2011	8.5103
2012	10.8904
2013	11.7007
2014	12.0372
2015	12.2256
2016	11.089
2017	7.1476