62% (1975)

61% (1972)

70% (1993)

67% (1971)

69% (1979)

62% (1995)

48% (2008)

54% (1975)

51% (1987)

65% (1978)

76% (1963)

76% (1966)

55% (1976)

72% (1973)

60% (1968)

55% (1981)

55% (1969)

61% (1986)

59% (1971)

64% (1973)