| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 03 Mar 2022 | 02 Mar 2022 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Nov 2021 | 10 Nov 2021 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 16 Aug 2021 | 13 Aug 2021 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 17 May 2021 | 13 May 2021 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 03 Mar 2021 | 02 Mar 2021 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 14 May 2020 | 14 May 2020 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 20 May 2019 | 16 May 2019 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 11 May 2018 | 10 May 2018 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 12 May 2017 | 11 May 2017 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Mar 2017 | 20 Mar 2017 | 000-16577 |
| 5/A | Open Document | Open Filing | PRIMARY DOCUMENT | 14 Feb 2017 | 31 Dec 2016 | 000-16577 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Feb 2017 | 31 Dec 2016 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 23 May 2016 | 20 May 2016 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 16 May 2016 | 12 May 2016 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 18 May 2015 | 18 May 2015 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 19 May 2014 | 19 May 2014 | 000-16577 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | 06 Mar 2014 | 17 May 2013 | 000-16577 |