Year	Percent
2000	4.03638
2001	2.84637
2002	2.95016
2003	2.67412
2004	2.35935
2005	2.36979
2006	2.33651
2007	2.28088
2008	6.72509
2009	6.6171
2010	7.05469
2011	7.35287
2012	7.24719
2013	7.15144
2014	7.34643
2015	7.62992
2016	8.17521
2017	8.51139