Year	Percent
1985	1.27625
1986	1.26918
1987	1.45626
1988	1.22107
1989	1.10818
1990	0.91492
1991	0.87112
1992	0.97318
1993	1.00196
1994	1.02406
1995	0.84236
1996	0.87481
1997	0.82469
1998	0.73147
1999	0.68365
2000	0.62552
2001	0.66692
2002	0.63585
2003	0.63012
2004	0.67053
2005	0.82118
2006	0.6551
2007	0.62121
2008	0.62415
2009	0.69315
2010	0.67191
2011	0.58801
2012	0.54241
2013	0.53013
2014	0.50382
2015	0.50359
2016	0.54267
2017	0.53174