| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | 09 Feb 2023 | 07 Feb 2023 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | 02 Jun 2022 | 01 Jun 2022 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | 23 May 2022 | 23 May 2022 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | 23 May 2022 | 20 May 2022 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | 17 May 2022 | 17 May 2022 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | 07 May 2021 | 06 May 2021 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 02 Feb 2021 | 29 Jan 2021 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | 01 Oct 2020 | 29 Sep 2020 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | 10 May 2019 | 08 May 2019 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | 11 May 2018 | 09 May 2018 | 000-20728 |
| 4 | Open Document | Open Filing | FORM 4 | 12 May 2017 | 10 May 2017 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 16 Nov 2016 | 14 Nov 2016 | 000-20728 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | 13 May 2016 | 13 May 2016 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 13 May 2016 | 13 May 2016 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 13 May 2016 | 11 May 2016 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 16 Nov 2015 | 12 Nov 2015 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 12 Nov 2015 | 11 Nov 2015 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 28 Aug 2015 | 26 Aug 2015 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 13 May 2015 | 11 May 2015 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 May 2014 | 19 May 2014 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 23 May 2013 | 21 May 2013 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 22 May 2013 | 20 May 2013 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 15 Jan 2013 | 07 Jan 2013 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 13 Jun 2012 | 11 Jun 2012 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 18 May 2012 | 17 May 2012 | 000-20728 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | 29 Mar 2012 | 29 Mar 2012 | 000-20728 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Jan 2012 | 07 Jan 2012 | 000-20728 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Jan 2012 | 07 Jan 2012 | 000-20728 |