71% (1980)

58% (1976)

66% (1993)

64% (1977)

55% (1979)

50% (1977)

50% (1990)

66% (1991)

30% (1987)

65% (1984)

59% (1974)

61% (1985)

50% (1978)

50% (1980)

50% (1975)

59% (1987)

70% (1994)

58% (1988)

60% (1982)

60% (1984)