57% (1977)

52% (1973)

54% (2014)

53% (1995)

52% (1980)

47% (1978)

52% (1976)

74% (1973)

44% (1977)

57% (1980)

47% (1976)

59% (1977)

48% (1977)

59% (1976)

55% (1980)

58% (1975)

59% (1975)

70% (1974)

48% (1977)

37% (1983)