Year	%
1973	84.68076
1974	99.58264
1975	85.06637
1976	96.02856
1977	93.45902
1979	93.47351
1982	98.2274
1983	98.59707
1984	94.61909
1985	96.98659
1986	97.54011
1987	99.41766
1988	100
1989	99.16157
1990	97.6171
1991	92.94149
1992	96.0513
1993	98.99334
1994	97.76635
1996	97.65106
1999	98.46648
2000	100
2001	98.04543
2002	96.14125
2003	99.54714
2004	99.04643
2005	100
2006	100
2009	95.52038
2010	91.77475
2011	98.8909
2012	98.10216
2013	100