60% (1973)

73% (1975)

70% (1982)

62% (1972)

60% (1978)

68% (1976)

72% (1972)

59% (1974)

73% (1974)

62% (1975)

60% (1976)

0% (1976)

50% (1972)

80% (1973)

0% (1975)

0% (1978)

40% (1974)