Year	Percent
1982	4.6
1983	4.7
1995	3.78
1996	2.6
1997	2.84
1998	3.31
1999	3.29
2000	3.06
2001	3.79
2002	3.77
2003	3.64
2004	3.81
2005	3.71
2006	3.4
2007	3.44
2008	3.67
2009	3.8
2010	3.43
2011	3.32
2012	3.15
2013	3.44
2014	3.22
2015	3.39
2016	3.92