52% (1987)

53% (1985)

38% (1989)

54% (1988)

40% (1990)

52% (1986)

49% (1986)

44% (1994)

45% (1991)

66% (1987)

50% (1986)

54% (1980)

50% (1988)

50% (1985)

40% (1982)

55% (1981)

36% (1991)

51% (1988)

43% (1990)

59% (1991)