50% (1977)

54% (1992)

53% (1979)

59% (1973)

54% (1981)

52% (1976)

48% (1993)

48% (1975)

55% (1982)

52% (1979)

53% (1988)

56% (1980)

68% (2004)

64% (1980)

53% (1977)

49% (1973)

54% (1986)

55% (1987)

55% (1980)

52% (1978)