60% (1974)

62% (1976)

56% (1980)

60% (1982)

25% (1979)

48% (1973)

60% (1979)

47% (1972)

60% (1981)

0% (1977)

62% (1982)

50% (1979)

65% (1981)

57% (1975)

0% (1975)

54% (1976)

80% (1971)

66% (1981)

55% (1979)

0% (1969)