57% (1972)

63% (1976)

64% (1974)

48% (1973)

66% (1980)

63% (1972)

43% (1978)

0% (1973)

80% (1980)

50% (1973)

66% (1975)

60% (1975)

80% (1976)

60% (1985)

37% (1979)

70% (1973)

60% (1975)

0% (1977)

80% (1978)

0% (1980)