52% (1987)

46% (1992)

58% (1990)

48% (1987)

45% (1985)

48% (1987)

39% (1994)

37% (1991)

32% (1986)

44% (1989)

47% (1986)

51% (1988)

59% (1986)

44% (1986)

53% (1988)

38% (1990)

46% (1986)

23% (1997)

44% (1995)

50% (1986)