Year	Percent
1994	5.17
1995	5.32
1996	5.45
1997	4.88
1998	4.37
1999	4.32
2000	4.12
2001	3.89
2002	3.76
2003	3.17
2004	1.62
2005	1.87
2006	1.99
2007	2.84
2008	2.66
2009	2.57
2010	2.42
2011	2.18
2012	2.06
2013	1.97
2014	2.06
2015	1.73
2016	1.64
2017	1.67