45% (1976)

50% (1971)

60% (2007)

59% (2004)

68% (2004)

60% (1980)

63% (1986)

57% (1981)

49% (1976)

48% (1982)

48% (1977)

38% (1972)

70% (1981)

48% (1976)

50% (1979)

49% (1989)

47% (1973)

10% (1976)

48% (1970)

38% (1977)