Year	Percent
1987	0.96411
1988	0.98358
1989	0.99243
1990	0.99489
1994	0.97917
2001	1.00887
2002	1.00326
2003	1.01243
2004	1.01641
2005	1.02341
2006	1.04979
2007	1.0543
2008	1.01876
2009	1.04143
2010	1.0438
2011	1.03637
2012	1.03658
2013	1.02589
2014	1.01586
2015	1.01074
2016	1.00733