45% (1996)

72% (1988)

61% (1995)

75% (1991)

68% (1996)

68% (1992)

57% (1997)

78% (1997)

62% (1996)

63% (1997)

66% (1992)

64% (1996)

46% (1996)

61% (1999)

58% (1994)

53% (1998)

63% (1997)

65% (1988)

62% (1994)

65% (1997)