63% (1980)

67% (1974)

63% (1978)

60% (1987)

71% (1979)

68% (1977)

57% (1979)

60% (1978)

66% (1979)

43% (1978)

45% (1994)

68% (1977)

61% (1974)

57% (1972)

51% (1976)

57% (1977)

43% (1996)

67% (1982)

40% (1976)

25% (1980)