Year	Percent
1998	0.75
1999	0.75
2000	0.83
2001	0.6
2002	0.87
2003	0.88
2004	0.67
2005	0.63
2006	0.95
2007	0.84
2008	0.87
2009	0.83
2010	0.7
2011	0.67
2012	0.69
2013	0.61
2014	0.58
2015	0.49
2016	0.44
2017	0.57