40% (1998)

54% (1996)

55% (1995)

55% (1992)

50% (1997)

56% (1991)

56% (1993)

48% (1995)

69% (1995)

66% (1997)

59% (1993)

67% (1998)

54% (1996)

51% (1992)

67% (1995)

60% (1992)

63% (1996)

54% (1996)

58% (1993)

61% (1993)