80% (1981)

55% (1982)

50% (1977)

90% (1961)

60% (1966)

0% (1973)

60% (1975)

40% (1968)

35% (1973)

0% (1972)

50% (1982)

0% (1978)

70% (1982)

35% (1968)

50% (1984)

0% (1979)

0% (1979)

0% (1977)

0% (1980)

60% (1973)