53% (1985)

53% (1988)

52% (1987)

39% (1990)

36% (1989)

65% (1987)

51% (1986)

46% (1985)

54% (1980)

55% (1981)

47% (1986)

36% (1991)

58% (1991)

50% (1988)

46% (1991)

48% (1988)

44% (1994)

40% (1982)

51% (1988)

15% (1991)