Year	Percent
1990	1.49
1995	1.58
2000	0.46
2001	0.92
2002	0.65
2003	0.86
2004	0.77
2005	0.85
2006	0.66
2007	0.91
2008	0.87
2009	0.67
2010	0.87
2011	0.67
2012	0.78
2013	0.8
2014	0.84
2015	1.07
2016	0.87
2017	1.19