67% (1970)

59% (1980)

62% (1976)

58% (1979)

53% (1980)

63% (1978)

64% (1970)

59% (1980)

54% (1980)

40% (1972)

63% (1982)

48% (1983)

65% (1971)

52% (1981)

55% (1971)

58% (1970)

73% (1971)

73% (1971)

66% (1975)

60% (1970)