57% (1971)

55% (1983)

73% (1982)

63% (1974)

57% (1981)

70% (1980)

65% (1977)

40% (1978)

64% (1976)

0% (1976)

60% (1979)

75% (1984)

70% (1975)

50% (1974)

50% (1975)

50% (1981)