Year	Percent
1996	1.94
1997	1.73
1998	1.87
1999	1.83
2000	1.66
2001	1.91
2002	1.9
2003	1.75
2004	1.42
2005	1.32
2006	1.37
2007	1.68
2008	1.46
2009	1.73
2010	1.64
2011	1.59
2012	1.56
2013	1.71
2014	1.57
2015	1.47
2016	1.57
2017	1.61