75% (1970)

76% (1981)

72% (1982)

73% (1977)

53% (1990)

72% (1982)

70% (1978)

76% (1978)

75% (1972)

50% (1974)

63% (1974)

74% (1996)

50% (1987)

60% (1990)

56% (1990)

50% (1979)

50% (1988)

63% (1977)

50% (1988)

55% (1975)