Year	Percent
1971	0.8852
1972	0.99914
1973	1.06443
1974	1.10547
1975	1.15815
1976	1.1518
1977	1.09884
1978	1.08019
1979	1.05148
1980	1.04124
1981	1.04037
1982	0.98385
1983	0.96933
1984	0.95903
1985	0.96047
1986	0.95338
1987	1.0556
1988	1.05346
1989	1.06283
1990	1.05742
1991	1.03928
1992	1.03857
1993	1.03484
1994	1.00182
1995	0.98641
1996	0.99261
1998	0.98123
1999	1.02631
2000	1.03402
2001	1.06394
2002	1.00359
2003	0.95799
2004	0.92113
2005	0.95382
2006	1.03689
2007	1.11492
2008	1.12495
2009	1.09004
2010	1.02434
2011	0.95677
2012	1.1786
2013	1.24465
2014	1.18291
2015	1.11893
2016	1.06941