Year	Percent
2002	8.8123
2003	7.8447
2004	9.5526
2005	9.1821
2006	9.1356
2007	8.6761
2008	9.0241
2009	7.2864
2010	7.4443
2011	7.5602
2012	8.4863
2013	6.7993
2014	7.9649
2015	6.4646
2016	8.9093
2017	8.643