Year	Percent
1999	7.97
2000	8.84
2001	10.68
2002	10.24
2003	3.39
2004	1.48
2005	1.39
2006	4.28
2007	3.37
2008	3.47
2009	3.38
2010	3.46
2011	4.42
2012	3.34
2013	3.02
2014	3.5
2015	6.12
2016	7.06
2017	5.51