| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | Jun 27, 2022 | Jun 23, 2022 | 000-21467 | |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 21, 2021 | Jun 17, 2021 | 000-21467 |
| 4 | Open Document | Open Filing | Mar 18, 2021 | Mar 17, 2021 | 000-21467 | |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Dec 14, 2020 | Dec 10, 2020 | 000-21467 |
| 4 | Open Document | Open Filing | Nov 19, 2019 | Nov 18, 2019 | 000-21467 | |
| 4 | Open Document | Open Filing | 4 | Jun 18, 2018 | Jun 14, 2018 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Dec 8, 2017 | Dec 7, 2017 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 19, 2017 | Jun 15, 2017 | 000-21467 |
| 4/A | Open Document | Open Filing | FORM 4 AMENDMENT | Aug 15, 2016 | Aug 15, 2016 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 10, 2016 | Aug 10, 2016 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 17, 2016 | Jun 16, 2016 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 12, 2015 | Jun 11, 2015 | 000-21467 |
| 4 | Open Document | Open Filing | FORM 4 | Aug 5, 2014 | Aug 5, 2014 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 20, 2014 | Jun 18, 2014 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 30, 2014 | May 28, 2014 | 000-21467 |
| 4/A | Open Document | Open Filing | AMENDMENT OF FORM 4 | May 8, 2014 | May 8, 2014 | 000-21467 |
| 4 | Open Document | Open Filing | FORM 4 | May 6, 2014 | May 6, 2014 | 000-21467 |