60% (1978)

65% (1985)

59% (1975)

52% (1978)

69% (1972)

60% (1977)

0% (1971)

40% (1977)

61% (1976)

44% (1978)

80% (1981)

70% (1971)

20% (1979)

0% (1969)

80% (1992)

0% (1968)

80% (2006)