62% (1982)

60% (1974)

60% (1980)

55% (1986)

70% (1983)

80% (1982)

67% (1974)

50% (1981)

65% (1982)

63% (1978)

70% (1980)

58% (1983)

67% (1977)

48% (1985)

67% (1976)

67% (1986)