71% (1982)

71% (1982)

67% (1975)

67% (1979)

68% (1975)

63% (1976)

72% (1979)

73% (1982)

67% (1978)

68% (1994)

68% (1977)

66% (1975)

57% (1979)

67% (1976)

66% (1987)

53% (1980)

63% (1984)

55% (1989)

53% (1980)

59% (1976)