| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 03 May 2022 | 01 May 2022 | 001-06961 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 May 2021 | 19 May 2021 | 001-06961 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 04 May 2021 | 01 May 2021 | 001-06961 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 29 May 2020 | 27 May 2020 | 001-06961 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 May 2020 | 01 May 2020 | 001-06961 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 03 May 2019 | 01 May 2019 | 001-06961 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 29 Apr 2019 | 25 Apr 2019 | 001-06961 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 27 Apr 2018 | 26 Apr 2018 | 001-06961 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 May 2017 | 04 May 2017 | 001-06961 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 02 May 2017 | 01 May 2017 | 001-06961 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 06 May 2016 | 05 May 2016 | 001-06961 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 01 May 2015 | 29 Apr 2015 | 001-06961 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 May 2014 | 01 May 2014 | 001-06961 |