| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | Mar 25, 2022 | Mar 23, 2022 | 001-15451 | |
| 4 | Open Document | Open Filing | Mar 4, 2022 | Mar 3, 2022 | 001-15451 | |
| 4 | Open Document | Open Filing | Feb 22, 2022 | Feb 17, 2022 | 001-15451 | |
| 4 | Open Document | Open Filing | Feb 11, 2022 | Feb 9, 2022 | 001-15451 | |
| 4 | Open Document | Open Filing | Feb 12, 2021 | Feb 10, 2021 | 001-15451 | |
| 4 | Open Document | Open Filing | Feb 14, 2020 | Feb 12, 2020 | 001-15451 | |
| 4 | Open Document | Open Filing | Feb 15, 2019 | Feb 14, 2019 | 001-15451 | |
| 3 | Open Document | Open Filing | Jan 18, 2019 | Jan 15, 2019 | 001-15451 |