71% (1979)

65% (1995)

77% (1969)

72% (1980)

62% (1980)

71% (1996)

67% (1982)

76% (1979)

69% (1982)

67% (1978)

60% (1984)

71% (1977)

66% (1994)

69% (1976)

71% (1994)

61% (1977)

54% (1980)

71% (1979)

63% (1981)

40% (1990)