51% (1985)

55% (1988)

53% (1987)

50% (1986)

50% (1988)

53% (1985)

52% (1986)

45% (1989)

52% (1986)

45% (1987)

37% (1991)

44% (1994)

65% (1987)

55% (1981)

54% (1980)

40% (1990)

52% (1989)

57% (1991)

49% (1988)

37% (1989)