81% (1980)

63% (1990)

68% (1968)

75% (1979)

65% (1982)

70% (1984)

69% (1975)

61% (1974)

80% (1988)

90% (1990)

80% (1967)

90% (1975)

60% (1984)

70% (1978)

65% (1976)

80% (1982)

0% (1985)

47% (1988)

70% (1984)

80% (1977)