| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Dec 2021 | 19 Dec 2021 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 03 Dec 2021 | 02 Dec 2021 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 02 Sep 2021 | 01 Sep 2021 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 09 Apr 2021 | 07 Apr 2021 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 22 Dec 2020 | 19 Dec 2020 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 07 Dec 2020 | 03 Dec 2020 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 23 Dec 2019 | 19 Dec 2019 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 09 Dec 2019 | 05 Dec 2019 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Dec 2018 | 19 Dec 2018 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Dec 2018 | 06 Dec 2018 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Dec 2017 | 19 Dec 2017 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 18 Dec 2017 | 14 Dec 2017 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Dec 2016 | 19 Dec 2016 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 Dec 2016 | 01 Dec 2016 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 22 Dec 2015 | 19 Dec 2015 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 09 Dec 2015 | 07 Dec 2015 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Dec 2014 | 08 Dec 2014 | 000-06920 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | 27 Mar 2014 | 17 Mar 2014 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 11 Mar 2014 | 08 Mar 2014 | 000-50646 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 04 Mar 2014 | 28 Feb 2014 | 000-50646 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 25 Feb 2014 | 22 Feb 2014 | 000-50646 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 18 Feb 2014 | 14 Feb 2014 | 000-50646 |