53% (1979)

48% (1977)

53% (1980)

53% (1988)

57% (1975)

54% (1981)

63% (1968)

65% (2002)

53% (1980)

52% (1979)

64% (1980)

55% (1987)

55% (1980)

74% (1974)

70% (1977)

46% (1986)

59% (1978)

54% (2009)

52% (1978)

54% (1986)