66% (1999)

64% (1997)

64% (1968)

58% (1980)

67% (1971)

71% (1971)

66% (1977)

64% (1969)

62% (1975)

69% (1988)

64% (1990)

62% (1984)

55% (1984)

64% (1982)

55% (1989)

68% (1973)

64% (2007)

73% (1988)

34% (1986)

61% (1995)