69% (1989)

73% (1986)

72% (1988)

58% (1986)

73% (1990)

69% (1990)

66% (1987)

69% (1983)

69% (1985)

57% (1987)

33% (1997)

46% (1989)

63% (1991)

62% (1982)

60% (1987)

60% (1988)

51% (1982)

66% (1984)

69% (1991)

45% (1987)