61% (1998)

65% (1997)

70% (1997)

45% (1999)

60% (1994)

59% (1996)

57% (1997)

53% (1998)

57% (1994)

59% (1994)

54% (1996)

53% (1997)

56% (1995)

71% (1995)

64% (1993)

69% (1998)

53% (1996)

48% (1997)

55% (1995)

62% (1997)