Year	Percent
1990	1.04766
1991	1.08957
1992	1.28629
1993	1.49932
1994	1.25774
1995	1.51513
1996	0.92577
1997	0.65526
1998	0.48386
1999	0.35286
2000	0.45308
2001	0.53142
2002	0.62765
2003	0.65898
2004	0.90781
2005	0.82187
2006	0.76316
2007	0.42418
2008	0.37486
2009	0.64883
2010	0.91706
2011	0.70787
2012	0.71667
2013	0.67191
2014	0.74138
2015	0.96729
2016	1.26212
2017	1.06536