52% (1980)

51% (1973)

56% (1977)

54% (2014)

74% (1973)

52% (1976)

52% (1995)

55% (1980)

48% (1978)

57% (1980)

47% (1977)

44% (1977)

59% (1976)

47% (1976)

70% (1974)

50% (1977)

58% (1975)

36% (1983)

58% (1975)

59% (1977)