54% (1989)

62% (1992)

54% (1994)

66% (1997)

60% (2001)

52% (2007)

69% (2000)

66% (1992)

55% (1993)

57% (1997)

56% (2001)

73% (2003)

63% (1996)

53% (1995)

62% (2002)

52% (2002)

48% (1996)

48% (2004)

65% (1999)

54% (1996)