Year	Percent
2000	3.75788
2001	2.99556
2002	2.8774
2003	2.67298
2004	2.37035
2005	2.07431
2006	1.81544
2007	1.91769
2008	5.87061
2009	6.53653
2010	7.19486
2011	7.21865
2012	7.2883
2013	7.26984
2014	7.33517
2015	7.41182
2016	8.08582
2017	8.63668