53% (1976)

56% (1992)

64% (1980)

51% (1979)

47% (1977)

55% (1982)

49% (1993)

54% (1988)

68% (2004)

70% (1974)

54% (1981)

57% (1981)

55% (1980)

52% (1979)

49% (1975)

55% (1977)

55% (1987)

51% (1978)

53% (1980)

53% (1977)