52% (1979)

48% (1977)

54% (1982)

60% (1978)

54% (1980)

55% (1981)

75% (1974)

52% (1978)

63% (1968)

71% (1973)

52% (1988)

53% (2009)

46% (1986)

65% (1974)

55% (1980)

64% (1980)

55% (1987)

51% (1979)

75% (1975)

57% (1981)