| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | Dec 15, 2022 | Dec 13, 2022 | 000-06936 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 15, 2021 | Dec 14, 2021 | 000-06936 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 10, 2020 | Dec 8, 2020 | 000-06936 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 12, 2019 | Dec 10, 2019 | 000-06936 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 13, 2018 | Dec 11, 2018 | 000-06936 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 13, 2017 | Dec 12, 2017 | 000-06936 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 15, 2016 | Dec 13, 2016 | 000-06936 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 10, 2015 | Dec 8, 2015 | 000-06936 |
| 4 | Open Document | Open Filing | FORM 4 | Jun 24, 2015 | Jun 22, 2015 | 000-06936 |
| 3 | Open Document | Open Filing | FORM 3 | Apr 2, 2015 | Mar 24, 2015 | 000-06936 |