Year	Percent
1990	0.94178
1991	0.94157
1992	1.05528
1993	1.2046
1994	1.02496
1995	1.38587
1996	0.80571
1997	0.60263
1998	0.43263
1999	0.28437
2000	0.2951
2001	0.36501
2002	0.50432
2003	0.52064
2004	0.72322
2005	0.69523
2006	0.64668
2007	0.38303
2008	0.31757
2009	0.49717
2010	0.67791
2011	0.60681
2012	0.56176
2013	0.60435
2014	0.65578
2015	0.81232
2016	1.02058
2017	0.87945