78% (1977)

77% (1975)

69% (1975)

69% (1986)

60% (1978)

0% (1973)

0% (1974)

0% (1975)

0% (1989)

58% (1975)

80% (1979)

0% (1974)

0% (1978)

57% (1973)

0% (1975)

10% (1983)