53% (1985)

53% (1987)

38% (1989)

39% (1990)

54% (1980)

65% (1987)

50% (1988)

50% (1988)

55% (1981)

55% (1988)

52% (1986)

51% (1986)

40% (1982)

36% (1988)

31% (1990)

36% (1991)

51% (1988)

43% (1990)

44% (1994)

48% (1986)