Year	Percent
2002	5.59593
2003	2.89461
2004	3.15336
2005	22.1787
2006	22.85171
2007	25.47105
2008	21.45129
2009	37.2491
2010	18.3226
2011	12.25724
2012	15.12742
2013	10.00144
2014	10.82661
2015	17.26503
2016	5.18198
2017	11.73607