60% (1988)

60% (1982)

80% (1980)

55% (1978)

70% (1976)

55% (1987)

69% (1986)

48% (1987)

83% (1981)

0% (1986)

50% (1979)

60% (1980)

59% (1987)

55% (1981)

71% (1981)

67% (1980)

65% (1986)

50% (1981)

20% (1985)

38% (1991)