62% (1982)

69% (1981)

63% (1981)

55% (1980)

42% (1983)

57% (1990)

53% (1989)

52% (1979)

52% (1988)

51% (1987)

39% (1989)

43% (1989)

57% (1979)

51% (1982)

48% (1983)

50% (1990)

43% (1992)

31% (1980)

45% (1984)

26% (1993)