62% (1979)

56% (1986)

61% (1979)

61% (1989)

62% (1979)

60% (1980)

44% (1981)

65% (1985)

56% (1988)

66% (1980)

50% (1985)

46% (1982)

40% (1979)

62% (1978)

0% (1983)

50% (1979)