| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 26 Oct 2021 | 23 Oct 2021 | 001-15589 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | 27 Oct 2020 | 23 Oct 2020 | 001-15589 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 26 Oct 2020 | 23 Oct 2020 | 001-15589 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 25 Oct 2019 | 23 Oct 2019 | 001-15589 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Dec 2018 | 21 Dec 2018 | 001-15589 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 24 Oct 2016 | 22 Oct 2016 | 001-15589 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 23 Oct 2015 | 22 Oct 2015 | 001-15589 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 24 Oct 2014 | 22 Oct 2014 | 001-15589 |