52% (1979)

55% (1992)

59% (1973)

48% (1977)

49% (1975)

54% (1981)

51% (1979)

52% (1976)

68% (2004)

52% (1988)

54% (1982)

55% (1980)

50% (1993)

64% (1980)

53% (1980)

56% (1977)

52% (1978)

57% (1981)

53% (1980)

48% (1976)