75% (1972)

73% (1977)

71% (1982)

75% (1970)

63% (1974)

72% (1982)

71% (1978)

76% (1978)

53% (1990)

50% (1987)

76% (1981)

74% (1996)

50% (1988)

50% (1979)

55% (1975)

0% (1979)

50% (1977)

60% (1989)

50% (1974)

63% (1977)