57% (1977)

55% (2014)

52% (1976)

51% (1973)

59% (1976)

53% (1980)

47% (1977)

56% (1980)

52% (1995)

59% (1980)

58% (1975)

60% (1977)

50% (1978)

75% (1973)

47% (1977)

48% (1977)

46% (1976)

37% (1983)

48% (1977)

69% (1974)