Year	Percent
1990	1.06705
1991	1.03318
1992	0.9575
1993	0.93139
1994	1.00895
1995	1.185
1996	1.16372
1997	1.15792
1998	1.13332
1999	0.94364
2000	0.76409
2001	0.75312
2002	0.79124
2003	0.79493
2004	0.72523
2005	0.72585
2006	1.0282
2007	1.02573
2008	1.02785
2009	0.64304
2010	0.64489
2011	0.56977
2012	0.59894
2013	0.60343
2014	0.60034
2015	0.57333
2016	0.54768
2017	0.50565
2018	0.48491
2019	0.49471
2020	0.49534