56% (1992)

52% (1979)

48% (1977)

59% (1973)

54% (1981)

49% (1993)

64% (1980)

53% (1976)

54% (1982)

49% (1975)

68% (2004)

57% (1981)

55% (1987)

55% (1980)

51% (1979)

52% (1988)

54% (1986)

71% (1974)

53% (1980)

52% (1978)