| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4/A | Open Document | Open Filing | OWNERSHIP DOCUMENT | 24 Nov 2021 | 22 Nov 2021 | 000-55768 |
| 4 | Open Document | Open Filing | 16 Nov 2021 | 12 Nov 2021 | 000-55768 | |
| 4 | Open Document | Open Filing | 04 May 2021 | 30 Apr 2021 | 000-55768 | |
| 4 | Open Document | Open Filing | 03 Mar 2021 | 02 Mar 2021 | 000-55768 | |
| 4 | Open Document | Open Filing | 03 Mar 2020 | 03 Jan 2020 | 000-55768 | |
| 3 | Open Document | Open Filing | 03 Mar 2020 | 26 Nov 2019 | 000-55768 |