Year	Percent
1990	1.69912
1991	1.57528
1992	1.25005
1993	1.26928
1994	1.29763
1995	1.70248
1996	1.67908
1997	1.59376
1998	1.54932
1999	1.47946
2000	1.32551
2001	1.18439
2002	1.32487
2003	1.13526
2004	1.07741
2005	1.03785
2006	1.01462
2007	0.9863
2008	0.96327
2009	0.95198
2010	0.95058
2011	0.91558
2012	0.91473
2013	0.91698
2014	0.86613
2015	0.86799
2016	0.8615
2017	0.85597
2018	0.8563
2019	0.86002
2020	0.87135