71% (1974)

75% (2001)

64% (1972)

63% (1973)

74% (1977)

68% (1985)

64% (1970)

69% (1975)

73% (1983)

60% (1974)

64% (1987)

67% (1973)

61% (1977)

47% (1980)

68% (1974)

53% (1984)

56% (1974)

40% (1975)

0% (1976)

61% (1994)