| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 5, 2023 | Jul 1, 2023 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Sep 16, 2021 | Sep 15, 2021 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 4, 2021 | Aug 3, 2021 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Oct 13, 2020 | Oct 13, 2020 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 5, 2020 | Feb 3, 2020 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 12, 2019 | Feb 8, 2019 | 000-22345 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 15, 2018 | Feb 13, 2018 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 14, 2018 | Feb 12, 2018 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 8, 2017 | Feb 6, 2017 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jan 31, 2017 | Jan 30, 2017 | 000-22345 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 11, 2016 | Feb 9, 2016 | 000-22345 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 22, 2014 | Jul 17, 2014 | 000-22345 |