53% (1980)

56% (1977)

57% (1984)

59% (1975)

53% (1979)

52% (1979)

57% (1982)

45% (1980)

54% (1978)

56% (1979)

51% (1987)

61% (1980)

38% (1985)

60% (1976)

67% (1977)

59% (1987)

54% (1980)

45% (2008)

66% (1984)

57% (1980)