71% (1998)

65% (1997)

71% (1995)

64% (1993)

61% (1998)

45% (1999)

70% (1995)

67% (1995)

60% (1996)

62% (1995)

70% (1997)

58% (1996)

55% (1994)

56% (1995)

57% (1997)

52% (1997)

63% (1995)

60% (1994)

68% (1998)

53% (1998)