Year	%
1972	64.44444
1973	81.03396
1974	81.04681
1975	82.61367
1976	93.56993
1977	97.90447
1978	94.91908
1980	100
1982	94.35087
1983	96.928
1986	78.83994
1988	79.5492
1992	69.45474
1993	56.81042
1995	72.62517
2001	57.97182
2002	52.14839
2003	87.74073
2004	67.84209
2007	69.11998
2008	68.7563
2009	74.43224
2011	74.79442