55% (1986)

62% (1979)

61% (1989)

62% (1979)

56% (1988)

60% (1980)

62% (1979)

66% (1985)

62% (1978)

66% (1980)

44% (1981)

40% (1979)

46% (1982)

50% (1985)

50% (1979)

0% (1983)