40% (1988)

54% (1985)

40% (1984)

61% (1984)

28% (1985)

67% (1984)

33% (1984)

49% (1983)

51% (1984)

46% (1986)

39% (1988)

48% (1987)

49% (1984)

42% (1987)

50% (1980)

39% (1981)

72% (1984)

40% (1987)

47% (1985)

56% (1986)