51% (1985)

49% (1988)

50% (1986)

53% (1985)

55% (1988)

52% (1986)

53% (1987)

40% (1990)

52% (1988)

50% (1988)

52% (1986)

54% (1980)

37% (1991)

65% (1987)

57% (1991)

37% (1989)

44% (1994)

44% (1990)

45% (1989)

55% (1981)