Survey Text
1981
No questionnaire text is available for this sample.
1980
No questionnaire text is available for this sample.
1979
No questionnaire text is available for this sample.
1978
No questionnaire text is available for this sample.
1977
No questionnaire text is available for this sample.
1976
No questionnaire text is available for this sample.
1975
No questionnaire text is available for this sample.
1974
No questionnaire text is available for this sample.
1973
No questionnaire text is available for this sample.
1972
No questionnaire text is available for this sample.
1971
No questionnaire text is available for this sample.
1970
No questionnaire text is available for this sample.
1969
No questionnaire text is available for this sample.