48% (1995)

61% (1994)

77% (1996)

62% (1994)

62% (1998)

66% (1992)

68% (1994)

48% (1995)

63% (1997)

63% (1998)

46% (1991)

67% (1995)

58% (1997)

61% (1994)

63% (1993)

69% (1993)

48% (1998)

56% (1998)

67% (1995)

58% (1993)