Year	Percent
2000	0.89166
2001	0.62983
2002	0.50587
2003	0.64053
2004	0.73258
2005	0.82463
2006	0.63214
2007	0.52967
2008	0.40431
2009	0.59216
2010	1.01007
2011	1.29336
2012	2.40234
2013	3.61167
2014	3.97377
2015	3.43838
2016	2.82455
2017	2.20277