75% (2001)

62% (1973)

67% (1985)

64% (1972)

70% (1974)

73% (1977)

64% (1970)

69% (1975)

73% (1983)

64% (1987)

67% (1974)

48% (1984)

57% (1974)

61% (1977)

0% (1976)

56% (1974)

67% (1973)

0% (1973)

40% (1975)

70% (1973)