Year	Percent
1990	3.09
1995	4.09
2000	1.66
2001	3.31
2002	3.74
2003	5.28
2004	4.63
2005	4.64
2006	4.68
2007	4.66
2008	4.44
2009	4.81
2010	5.12
2011	4.26
2012	4.79
2013	4.59
2014	4.45
2015	4.73
2016	4.35
2017	3.62