61% (1979)

66% (1980)

55% (1986)

62% (1979)

61% (1989)

61% (1979)

56% (1988)

65% (1985)

60% (1980)

44% (1981)

62% (1978)

40% (1979)

46% (1982)

50% (1985)

0% (1983)

50% (1979)