62% (1992)

55% (1994)

67% (1992)

66% (1997)

55% (1993)

61% (2001)

74% (2003)

54% (1995)

55% (2007)

54% (1989)

59% (2002)

41% (2007)

69% (2000)

54% (1996)

48% (1996)

57% (1997)

40% (1993)

50% (1998)

62% (2002)

50% (2001)