Year	Percent
2000	15.8155
2001	18.8612
2002	17.3609
2003	13.1947
2004	11.6235
2005	9.8353
2006	9.2963
2007	7.2863
2008	5.7579
2009	6.6244
2010	9.6078
2011	10.1075
2012	10.8404
2013	11.8446
2014	10.4043
2015	8.417
2016	6.9685
2017	5.9459