76% (1970)

75% (1972)

76% (1981)

72% (1982)

62% (1974)

74% (1996)

72% (1982)

75% (1978)

73% (1977)

53% (1990)

50% (1974)

70% (1978)

56% (1990)

81% (1994)

50% (1977)

50% (1987)

65% (1996)

0% (1979)

50% (1979)

55% (1975)