50% (1984)

52% (1996)

52% (1998)

65% (1998)

57% (2001)

49% (1990)

68% (1989)

54% (1991)

48% (1987)

65% (1990)

61% (1996)

54% (1994)

49% (1989)

52% (1996)

38% (1999)

52% (1994)

64% (1986)

54% (1990)

62% (1984)

67% (1987)