56% (1994)

62% (1992)

49% (1989)

61% (2001)

66% (1997)

67% (1992)

69% (2000)

59% (2002)

55% (1993)

54% (1995)

43% (1982)

54% (2007)

54% (1996)

74% (2003)

41% (2007)

62% (2002)

48% (1996)

57% (1997)

52% (2002)

50% (1998)