43% (1974)

69% (1977)

44% (1979)

47% (1978)

50% (1979)

52% (1976)

54% (1977)

48% (1976)

48% (1982)

54% (1988)

32% (1989)

61% (1975)

57% (1989)

66% (1968)

53% (1998)

57% (1974)

10% (1997)

50% (1978)

50% (1989)

52% (1985)