51% (1989)

60% (1990)

61% (1989)

53% (1989)

58% (1989)

65% (1978)

51% (1987)

56% (1987)

47% (1985)

52% (1988)

46% (1988)

50% (1984)

44% (1987)

62% (1988)

45% (1988)

36% (1986)

32% (1987)

49% (1989)

51% (1989)

70% (1982)