60% (1971)

49% (1967)

38% (1989)

64% (1972)

67% (1971)

67% (1975)

62% (1980)

56% (1971)

67% (2005)

59% (1979)

67% (2009)

53% (1976)

43% (1970)

0% (1984)

73% (2009)

57% (1980)

71% (2001)

69% (1961)

70% (2001)

65% (1985)