| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 8, 2022 | Nov 8, 2022 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 9, 2022 | Aug 8, 2022 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 11, 2022 | May 10, 2022 | 000-31641 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 9, 2022 | Feb 8, 2022 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 10, 2021 | Nov 9, 2021 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 25, 2021 | Aug 24, 2021 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 10, 2021 | Aug 9, 2021 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 10, 2021 | May 7, 2021 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 10, 2021 | Feb 9, 2021 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 9, 2020 | Nov 9, 2020 | 000-31641 |
| 4 | Open Document | Open Filing | FORM 4 | Aug 7, 2020 | Aug 7, 2020 | 000-31641 |
| 4 | Open Document | Open Filing | FORM 4 | May 7, 2020 | May 7, 2020 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 10, 2020 | Feb 7, 2020 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 7, 2019 | Nov 7, 2019 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 6, 2019 | Aug 6, 2019 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 7, 2019 | May 7, 2019 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 8, 2019 | Feb 7, 2019 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 8, 2018 | Nov 7, 2018 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 7, 2018 | Aug 7, 2018 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 8, 2018 | May 8, 2018 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 8, 2018 | Feb 7, 2018 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 8, 2017 | Nov 7, 2017 | 000-31641 |