59% (1986)

50% (1987)

36% (1991)

57% (1990)

43% (1995)

54% (1988)

43% (1989)

52% (1988)

50% (1986)

51% (1987)

34% (1986)

45% (1985)

43% (1985)

47% (1986)

48% (1986)

49% (1990)

47% (1993)

51% (1989)

42% (1990)

46% (1992)