73% (1980)

71% (1979)

66% (1994)

71% (1994)

77% (1969)

65% (1995)

67% (1982)

70% (1996)

77% (1979)

69% (1976)

70% (1982)

56% (1996)

40% (1989)

71% (1977)

61% (1984)

64% (1980)

64% (2006)

72% (1979)

65% (2000)

67% (1978)