52% (1976)

32% (1981)

44% (1973)

41% (1978)

44% (1980)

31% (1975)

45% (1980)

52% (1977)

42% (1986)

31% (1982)

55% (1977)

33% (1983)

66% (2009)

38% (1983)

37% (1977)

46% (1975)

25% (1974)

38% (1980)

42% (1981)

43% (1977)