60% (1982)

80% (1980)

54% (1978)

51% (1987)

82% (1981)

60% (1980)

62% (1980)

59% (1982)

56% (1975)

69% (1981)

61% (1977)

53% (1982)

50% (1981)

68% (1981)

64% (1987)

48% (1987)

58% (1981)

57% (1986)

68% (1978)

56% (1987)