Year	%
1971	93.70845
1972	98.83556
1973	96.33895
1974	96.2483
1975	100
1976	98.51782
1977	98.18182
1978	100
1982	100
1984	96.07619
1985	98.66444
1986	100
1987	98.55471
1988	99.24812
1989	98.41994
1990	97.55752
1991	99.86699
1992	98.00944
1993	89.42806
1994	100
1995	100
1996	100
1997	98.02657
1998	100
1999	99.41013
2000	99.44828
2001	97.36149
2002	99.92819
2004	100
2005	98.1125
2006	94.97748
2007	99.56507
2010	98.08044
2011	100
2012	97.83356
2014	93.6745
2015	97.14555
2016	97.74222