75% (1970)

76% (1981)

76% (1978)

74% (1972)

74% (1996)

68% (1978)

71% (1982)

50% (1977)

63% (1977)

72% (1982)

50% (1974)

50% (1988)

60% (1984)

55% (1975)

64% (1986)

50% (1987)

0% (1979)

72% (1977)

54% (1990)

0% (1978)