73% (1977)

75% (1972)

71% (1982)

63% (1974)

75% (1970)

71% (1978)

72% (1982)

76% (1978)

53% (1990)

74% (1996)

76% (1981)

50% (1987)

50% (1979)

50% (1988)

55% (1975)

0% (1979)

50% (1977)

60% (1989)

50% (1974)

60% (1990)