48% (1977)

53% (1979)

52% (1979)

54% (1981)

53% (1988)

64% (1980)

46% (1986)

54% (2009)

56% (1975)

55% (1982)

58% (1978)

75% (1974)

56% (1980)

52% (1978)

50% (1978)

55% (1980)

64% (1968)

60% (1976)

53% (1980)

53% (1980)