69% (1989)

55% (1991)

69% (1985)

66% (1981)

58% (1989)

66% (1984)

49% (1994)

50% (1992)

63% (1986)

48% (1995)

56% (1986)

57% (1995)

53% (1992)

60% (1987)

62% (1989)

61% (1988)

50% (1993)

66% (1984)

56% (1989)

48% (1987)