33% (1975)

62% (1974)

62% (1987)

60% (1973)

62% (1978)

56% (1979)

79% (1981)

48% (1986)

0% (1977)

55% (1980)

20% (1980)

70% (1979)

49% (1981)

49% (1982)

0% (1980)

59% (1982)

0% (1984)

44% (1988)

50% (1980)

60% (1979)