50% (1975)

0% (1967)

95% (1989)

60% (1989)

55% (1979)

47% (1974)

73% (1977)

50% (1982)

70% (1980)

60% (1990)

70% (1969)

0% (1989)

90% (1987)

0% (1982)

90% (1968)

0% (1985)

0% (1987)

0% (1989)

0% (1992)

50% (1991)