Year	Percent
1990	1.38131
1991	1.55718
1992	1.50247
1993	1.44814
1994	1.39729
1995	1.63951
1996	1.58473
1997	1.53437
1998	1.66365
1999	1.70079
2000	1.65431
2001	1.59915
2002	1.62607
2003	1.57733
2004	1.45878
2005	1.55928
2006	1.51558
2007	1.45072
2008	1.38865
2009	1.26958
2010	1.30297
2011	1.2622
2012	1.22524
2013	1.19003
2014	1.15529
2015	0.96052
2016	0.93058
2017	0.90087
2018	0.87261
2019	0.84617
2020	0.84368