70% (1985)

60% (1980)

65% (1982)

0% (1975)

52% (1986)

0% (1975)

45% (1980)

80% (1984)

62% (1985)

63% (1974)

60% (1990)

75% (1989)

63% (1990)

57% (1972)

65% (1983)

0% (1992)

80% (1988)

80% (1982)

77% (1989)

71% (1985)