59% (1988)

74% (1987)

59% (1989)

67% (1988)

61% (1989)

59% (1989)

54% (1990)

61% (1988)

56% (1988)

51% (1990)

60% (1990)

50% (1987)

61% (1987)

57% (1986)

55% (1989)

69% (1987)

44% (1989)

59% (1989)

42% (1988)

45% (1988)