Year	Percent
2002	40.05
2006	55.17
2007	47.89
2008	53.3404
2009	55.1307
2010	53.3642
2011	52.6897
2012	56.7846
2013	52.008
2014	48.4524
2015	38.2714
2016	38.5451
2017	38.39