45% (1983)

47% (1977)

60% (1979)

65% (1979)

50% (1976)

40% (1980)

50% (1977)

66% (1981)

60% (1980)

29% (1979)

70% (1978)

60% (1978)

75% (1981)

90% (1975)

75% (1974)

48% (1978)

0% (1980)

0% (1974)

87% (1978)

80% (1980)