53% (1976)

53% (1979)

54% (1992)

48% (1977)

54% (1981)

48% (1993)

53% (1980)

68% (2004)

54% (1982)

49% (1975)

64% (1980)

55% (1980)

53% (1988)

52% (1979)

57% (1981)

59% (1973)

52% (1978)

41% (1974)

53% (1980)

54% (1986)