50% (1970)

60% (1976)

78% (1980)

0% (1975)

70% (1973)

80% (1975)

0% (1973)

50% (1974)

64% (1970)

100% (1973)

55% (1969)

0% (1974)

70% (1973)

70% (1975)

0% (1961)

0% (1975)

0% (1971)

85% (1975)

80% (1974)

80% (1975)