Year	Percent
2001	2.2187
2002	2.12683
2003	1.71894
2004	2.61967
2005	3.41187
2006	3.18803
2007	2.79779
2008	2.28087
2009	2.22734
2010	2.2345
2011	2.20445
2012	1.95611
2013	2.04656
2014	1.99102
2015	1.82216
2016	1.68147
2017	1.80966