41% (1982)

40% (1978)

55% (1990)

70% (1977)

57% (1978)

41% (1985)

44% (1983)

57% (1976)

49% (1974)

51% (1985)

47% (1988)

49% (1988)

64% (1977)

52% (1986)

53% (1982)

40% (1988)

56% (1983)

52% (1977)

40% (1974)

44% (1988)