53% (1988)

51% (1987)

57% (1990)

49% (1987)

58% (1986)

50% (1990)

46% (1985)

36% (1991)

57% (1990)

52% (1988)

49% (1986)

32% (2000)

43% (1989)

43% (1985)

42% (1990)

25% (1997)

50% (1998)

34% (1986)

39% (1991)

40% (1994)