100% (1970)

80% (1974)

100% (1970)

50% (1978)

70% (1992)

100% (1970)

10% (1979)

80% (1970)

0% (1990)

40% (1974)

60% (1973)

70% (1971)

50% (1977)

60% (1987)

10% (1983)

60% (1976)

10% (1985)

70% (1983)

50% (1972)

40% (1978)