63% (1977)

60% (1974)

63% (1970)

67% (1975)

60% (1982)

64% (1984)

50% (1976)

30% (1984)

70% (1972)

65% (1979)

62% (1972)

58% (2003)

57% (1972)

65% (1982)

63% (1967)

61% (1971)

58% (1977)

35% (1979)

67% (1977)

60% (1978)