53% (1985)

50% (1988)

53% (1987)

55% (1988)

54% (1980)

38% (1989)

66% (1987)

55% (1981)

50% (1985)

40% (1990)

40% (1982)

45% (1989)

43% (1990)

51% (1988)

38% (1990)

49% (1986)

36% (1991)

51% (1986)

36% (1988)

44% (1994)