Year	%
1975	93.42105
1977	92.06642
1978	97.0696
1982	91.75868
1983	91.72584
1984	93.1418
1985	92.49358
1986	95.07296
1987	93.66259
1988	94.76985
1989	95.50774
1991	96.72653
1993	97.90486
1994	98.79032
1995	98.49732
1996	98.96578
1999	98.9925
2000	99.81262
2001	98.99147
2002	98.56667
2011	100
2012	100
2013	99.80737
2014	99.64189
2015	98.83381
2016	98.82031
2017	100