70% (1988)

50% (1980)

70% (1990)

50% (1980)

60% (1956)

53% (1973)

40% (1976)

80% (1985)

70% (1987)

80% (1991)

42% (1974)

0% (1991)

45% (1975)

70% (1988)

50% (1979)

53% (1968)

50% (1990)

0% (1988)

60% (1978)

70% (1960)