Year	Percent
1971	0.80903
1982	0.96383
1985	0.92786
1992	1.0471
1994	1.04929
1995	1.06818
1996	1.05896
1997	1.0485
1998	1.04686
1999	1.04436
2000	1.04284
2001	1.0457
2002	1.00661
2003	0.98042
2004	0.96481
2005	0.95444
2006	0.94714
2007	0.95685
2008	0.95571
2009	0.95891
2010	0.95773
2011	0.95027
2012	0.95251
2013	0.95075
2014	0.95038
2015	0.94485
2016	0.94989