60% (1997)

81% (1992)

70% (1994)

64% (1992)

70% (1996)

60% (1996)

62% (1993)

63% (1993)

67% (1997)

67% (1992)

65% (1992)

48% (1994)

65% (1994)

64% (1997)

53% (1996)

44% (1994)

49% (1994)

61% (1996)

49% (1995)

46% (1989)