54% (1985)

52% (1987)

40% (1990)

52% (1988)

55% (1980)

36% (1989)

53% (1986)

47% (1986)

49% (1988)

65% (1987)

48% (1988)

46% (1985)

54% (1981)

44% (1994)

51% (1988)

44% (1986)

40% (1982)

46% (1991)

48% (1986)

43% (1987)