Year	Percent
2002	34.3233
2003	33.813
2004	29.4541
2005	30.2141
2006	27.1943
2007	22.1661
2008	20.6318
2009	23.7366
2010	31.4992
2011	37.04
2012	42.1492
2013	49.9122
2014	44.8971
2015	41.3897
2016	31.2281
2017	27.0818