71% (1982)

72% (1977)

62% (1974)

56% (1990)

77% (1981)

81% (1994)

74% (1996)

71% (1982)

60% (1989)

75% (1970)

75% (1978)

74% (1972)

60% (1990)

71% (1978)

53% (1990)

50% (1988)

0% (1979)

50% (1988)

50% (1988)

50% (1979)