49% (1984)

57% (1981)

65% (1991)

51% (1986)

62% (1989)

64% (1982)

50% (1987)

58% (1991)

38% (1988)

20% (1989)

56% (1984)

72% (1989)

36% (1990)

42% (1988)

35% (1986)

0% (1980)