63% (1992)

66% (1997)

49% (1996)

61% (2001)

69% (2000)

55% (1993)

54% (1989)

56% (2001)

54% (1995)

73% (2003)

67% (1992)

52% (2007)

50% (1998)

54% (1987)

57% (1997)

54% (1994)

64% (1996)

52% (2001)

54% (1996)

48% (2004)