53% (1985)

53% (1987)

55% (1988)

65% (1987)

49% (1988)

55% (1981)

40% (1990)

50% (1988)

43% (1990)

39% (1982)

51% (1986)

54% (1980)

51% (1986)

50% (1985)

36% (1991)

44% (1994)

57% (1991)

45% (1987)

37% (1989)

36% (1988)