Year	Percent
1981	0.82414
1986	0.87278
1991	0.98369
1992	0.97036
1993	0.96457
1994	0.94328
1995	0.94904
1996	0.99302
1997	0.98512
1999	0.99678
2000	0.99624
2001	1.01149
2002	1.0026
2003	0.98755
2004	0.98013
2005	0.97629
2006	1.01048
2008	0.97088
2013	0.99999
2014	1.00921
2015	1.01498
2016	1.01245