67% (1981)

71% (1979)

63% (1981)

51% (1990)

73% (1982)

77% (1979)

50% (1984)

52% (1981)

64% (1980)

78% (1980)

63% (1990)

60% (1977)

66% (1980)

48% (1981)

55% (1987)

54% (1979)

67% (1981)

64% (1975)

69% (1978)

60% (1980)