56% (1996)

59% (1997)

54% (1993)

52% (1995)

66% (1995)

56% (1995)

55% (1992)

58% (1998)

60% (1989)

54% (1996)

60% (1994)

67% (1993)

62% (1998)

58% (1993)

45% (1992)

47% (1997)

62% (1995)

63% (1997)

48% (1995)

45% (1993)