58% (1995)

59% (1997)

40% (1994)

70% (1998)

73% (1999)

62% (1996)

67% (1995)

52% (1999)

60% (1999)

60% (1996)

56% (1995)

65% (1995)

60% (1998)

57% (1996)

61% (1999)

61% (1998)

66% (1995)

68% (1994)

58% (1997)

61% (1997)