48% (1987)

42% (1982)

47% (1981)

56% (1972)

0% (1988)

46% (1982)

0% (1987)

80% (1989)

60% (1988)

0% (1989)

75% (1980)

60% (1984)

59% (1976)

80% (1976)

52% (1978)

0% (1986)

60% (1980)

65% (1977)

47% (1984)

45% (1980)