Year	Percent
2000	3.2122
2001	2.6255
2002	2.6039
2003	3.776
2004	3.4666
2005	4.3836
2006	3.8597
2007	3.3893
2008	3.178
2009	5.2728
2010	6.1266
2011	8.0576
2012	12.4617
2013	16.5148
2014	17.0479
2015	15.0376
2016	12.6059
2017	10.8572