57% (1998)

67% (1983)

70% (1994)

67% (1990)

62% (1984)

67% (1991)

62% (1990)

59% (1986)

68% (1990)

61% (1984)

62% (1974)

54% (2001)

64% (1987)

56% (1973)

42% (1998)

62% (1988)

64% (1982)

58% (1982)

59% (1990)

57% (1990)