50% (1973)

57% (1977)

51% (1978)

52% (1995)

59% (1976)

54% (2014)

74% (1973)

47% (1976)

56% (1980)

52% (1976)

48% (1977)

52% (1980)

37% (1983)

59% (1980)

59% (1977)

46% (1977)

59% (1975)

57% (1975)

70% (1974)

45% (1978)