Year	Percent
2001	2.3951
2002	2.05562
2003	1.47199
2004	2.14026
2005	2.5091
2006	2.23065
2007	2.02619
2008	1.55616
2009	1.54793
2010	1.61923
2011	1.69312
2012	1.44387
2013	1.57701
2014	1.55884
2015	1.40692
2016	1.27846
2017	1.38213