54% (1993)

64% (1995)

69% (1998)

73% (1998)

61% (1999)

63% (1998)

61% (1989)

60% (1996)

63% (1993)

61% (1994)

54% (1995)

58% (1995)

46% (1993)

67% (1997)

63% (1998)

62% (1998)

63% (1993)

62% (1998)

57% (1996)

66% (1992)