| Variable | Year | Supplement |
|---|---|---|
| INDSTRY2 | 2003 | Sample adult questionnaire |
| INDSTRY2 | 2002 | Sample adult questionnaire |
| INDSTRY2 | 2001 | Sample adult questionnaire |
| INDSTRY2 | 2000 | Sample adult questionnaire |
| INDSTRY2 | 1999 | Sample adult questionnaire |
| INDSTRY2 | 1998 | Sample adult questionnaire |
| INDSTRY2 | 1997 | Sample adult questionnaire |