45% (1993)

60% (1996)

49% (1997)

63% (1996)

52% (2000)

69% (1995)

67% (1993)

65% (1990)

70% (1995)

60% (1997)

53% (1993)

61% (1992)

66% (1995)

70% (1997)

69% (1992)

47% (2001)

54% (1992)

63% (1996)

73% (1994)

61% (1992)