60% (1979)

59% (1980)

65% (1990)

56% (1992)

0% (1988)

55% (1978)

20% (1993)

0% (1988)

67% (1981)

62% (1982)

42% (1975)

60% (1972)

0% (1971)

0% (1982)

50% (1970)

0% (1977)

0% (1980)

15% (1974)

0% (1971)

43% (1979)