64% (1980)

50% (1975)

55% (1978)

70% (1973)

57% (1972)

72% (1973)

40% (1978)

73% (1977)

50% (1976)

0% (1982)

78% (1973)

50% (1972)

64% (1969)

63% (1981)

53% (1974)

51% (1978)

50% (1979)

74% (1968)

60% (1970)

0% (1971)