| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 20 Dec 2021 | 19 Dec 2021 | 001-03880 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 13 Dec 2021 | 09 Dec 2021 | 001-03880 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 06 Dec 2021 | 02 Dec 2021 | 001-03880 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Dec 2020 | 19 Dec 2020 | 001-03880 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 14 Dec 2020 | 10 Dec 2020 | 001-03880 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Dec 2020 | 09 Dec 2020 | 001-03880 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 23 Dec 2019 | 19 Dec 2019 | 001-03880 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 17 Dec 2019 | 15 Dec 2019 | 001-03880 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 11 Dec 2019 | 09 Dec 2019 | 001-03880 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Jul 2019 | 01 Jul 2019 | 001-03880 |