76% (1981)

75% (1978)

75% (1970)

75% (1972)

71% (1982)

73% (1977)

74% (1996)

63% (1974)

72% (1982)

53% (1990)

70% (1978)

0% (1979)

50% (1977)

50% (1988)

56% (1990)

65% (1996)

81% (1994)

60% (1984)

50% (1987)

50% (1974)