75% (1970)

76% (1981)

71% (1982)

73% (1977)

72% (1982)

50% (1974)

70% (1978)

76% (1978)

75% (1972)

53% (1990)

74% (1996)

63% (1974)

56% (1990)

0% (1979)

50% (1987)

55% (1975)

60% (1990)

50% (1979)

50% (1988)

63% (1977)