58% (1993)

67% (1998)

55% (1995)

47% (1991)

60% (1992)

62% (1997)

50% (1995)

55% (1992)

53% (1996)

56% (1993)

40% (1998)

54% (1992)

52% (1994)

68% (1997)

53% (1993)

48% (1995)

59% (1993)

66% (1995)

54% (1995)

60% (1991)