56% (1994)

62% (1992)

49% (1989)

67% (1992)

61% (2001)

71% (1996)

66% (1997)

69% (2000)

74% (2003)

55% (1993)

57% (1997)

41% (2007)

54% (1996)

54% (1995)

61% (1999)

40% (1993)

54% (2007)

62% (2002)

56% (2001)

59% (2002)