50% (1973)

56% (1977)

50% (1978)

47% (1976)

59% (1976)

52% (1976)

46% (1977)

74% (1973)

58% (1980)

54% (2014)

52% (1995)

52% (1980)

56% (1980)

59% (1977)

47% (1977)

68% (1974)

48% (1977)

58% (1975)

56% (1975)

37% (1983)