54% (1989)

62% (1992)

60% (2001)

73% (2003)

54% (1993)

66% (1997)

56% (2001)

67% (1992)

54% (1995)

54% (1994)

69% (2000)

65% (1999)

53% (2007)

48% (2004)

52% (2002)

48% (1996)

57% (1997)

58% (1999)

54% (1996)

50% (1998)