63% (1974)

70% (1975)

64% (1976)

0% (1976)

50% (1974)

50% (1981)

30% (1975)

57% (1971)

57% (1981)

55% (1983)

40% (1978)

70% (1980)

60% (1979)

66% (1977)

74% (1984)

73% (1982)