67% (1976)

73% (1983)

53% (1978)

67% (1979)

58% (1989)

46% (1973)

0% (1994)

62% (1973)

43% (1989)

82% (1972)

45% (1986)

60% (1974)

70% (1974)

60% (1976)

75% (1975)

43% (1977)

45% (1972)

70% (1973)

55% (1971)

62% (1978)