79% (1975)

81% (1974)

79% (1975)

57% (1969)

60% (1981)

79% (1978)

70% (1978)

80% (1976)

79% (1977)

70% (1979)

81% (1976)

70% (1974)

79% (1977)

79% (1976)

42% (2005)

71% (1980)

50% (1972)

50% (1970)

67% (1979)

58% (1971)