| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 16 Jun 2021 | 15 Jun 2021 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 17 May 2021 | 14 May 2021 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 08 Dec 2020 | 06 Dec 2020 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 23 Nov 2020 | 20 Nov 2020 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 Oct 2020 | 01 Oct 2020 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 25 Sep 2020 | 23 Sep 2020 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 20 Feb 2020 | 19 Feb 2020 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Dec 2019 | 08 Dec 2019 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 22 Nov 2019 | 20 Nov 2019 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 03 Oct 2019 | 01 Oct 2019 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 24 Sep 2019 | 20 Sep 2019 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 08 May 2019 | 06 May 2019 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 07 May 2019 | 03 May 2019 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 11 Dec 2018 | 09 Dec 2018 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Nov 2018 | 20 Nov 2018 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 22 Oct 2018 | 19 Oct 2018 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 24 Sep 2018 | 20 Sep 2018 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 08 May 2018 | 06 May 2018 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Nov 2017 | 20 Nov 2017 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 20 Oct 2017 | 19 Oct 2017 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 01 May 2017 | 30 Apr 2017 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 20 Oct 2016 | 19 Oct 2016 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 02 May 2016 | 01 May 2016 | 000-19528 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 01 Feb 2016 | 29 Jan 2016 | 000-19528 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | 29 Oct 2015 | 19 Oct 2015 | 000-19528 |