| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | Jun 8, 2022 | Jun 7, 2022 | 000-21467 | |
| 4 | Open Document | Open Filing | Apr 5, 2022 | Apr 1, 2022 | 000-21467 | |
| 4 | Open Document | Open Filing | Apr 1, 2022 | Mar 30, 2022 | 000-21467 | |
| 4 | Open Document | Open Filing | Nov 16, 2021 | Nov 12, 2021 | 000-21467 | |
| 4 | Open Document | Open Filing | Jun 3, 2021 | Jun 2, 2021 | 000-21467 | |
| 4 | Open Document | Open Filing | Apr 5, 2021 | Apr 1, 2021 | 000-21467 | |
| 4 | Open Document | Open Filing | Mar 25, 2021 | Mar 23, 2021 | 000-21467 | |
| 4 | Open Document | Open Filing | Dec 3, 2020 | Dec 1, 2020 | 000-21467 | |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Dec 1, 2020 | Dec 1, 2020 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIPDOCUMENT | Aug 20, 2020 | Aug 18, 2020 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jul 28, 2020 | Jul 13, 2020 | 000-21467 |
| 4 | Open Document | Open Filing | Apr 3, 2020 | Apr 1, 2020 | 000-21467 | |
| 4 | Open Document | Open Filing | FORM 4 | Apr 24, 2019 | Apr 22, 2019 | 000-21467 |
| 4 | Open Document | Open Filing | FORM 4 | Apr 3, 2019 | Apr 1, 2019 | 000-21467 |
| 4 | Open Document | Open Filing | 4 | Jun 18, 2018 | Jun 14, 2018 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 3, 2018 | Apr 1, 2018 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 4, 2017 | Apr 1, 2017 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 17, 2017 | Mar 15, 2017 | 000-21467 |
| 4 | Open Document | Open Filing | FORM 4 | Dec 14, 2016 | Dec 13, 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 9, 2016 | Jun 9, 2016 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 5, 2016 | Apr 1, 2016 | 000-21467 |
| 4 | Open Document | Open Filing | FORM 4 | Nov 18, 2015 | Nov 17, 2015 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 21, 2015 | Aug 20, 2015 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 3, 2015 | Apr 1, 2015 | 000-21467 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 19, 2015 | Mar 17, 2015 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 20, 2014 | Jun 18, 2014 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 2, 2014 | Apr 1, 2014 | 000-21467 |