71% (1998)

66% (1997)

72% (1995)

67% (1998)

70% (2001)

60% (1994)

50% (1993)

57% (2000)

54% (1998)

44% (1999)

44% (1998)

47% (1997)

52% (1997)

46% (1996)

40% (1994)

48% (1995)

64% (1997)

62% (1990)

60% (1988)

80% (1995)