58% (1990)

49% (1987)

52% (1987)

46% (1992)

48% (1987)

48% (1986)

53% (1988)

44% (1989)

36% (1991)

43% (1985)

52% (1988)

47% (1993)

50% (1992)

45% (1985)

40% (1992)

23% (1997)

43% (1991)

49% (1994)

57% (1990)

44% (1986)