56% (1979)

53% (1991)

57% (1985)

36% (1983)

53% (1985)

53% (1989)

64% (1982)

58% (1988)

61% (1982)

45% (1991)

59% (1981)

54% (1985)

56% (1991)

54% (1991)

35% (1982)

61% (1983)

44% (1981)

61% (1991)

41% (1987)

30% (1981)