56% (1978)

56% (1994)

49% (1977)

68% (1980)

55% (1993)

48% (1971)

20% (1993)

64% (1978)

53% (1973)

0% (1972)

20% (1973)

55% (1978)

90% (1978)

0% (1971)

60% (1986)