| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | 21 Jun 2021 | 17 Jun 2021 | 000-21467 | |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 14 Dec 2020 | 10 Dec 2020 | 000-21467 |
| 4 | Open Document | Open Filing | 19 Nov 2019 | 18 Nov 2019 | 000-21467 | |
| 4 | Open Document | Open Filing | 4 | 18 Jun 2018 | 14 Jun 2018 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 19 Jun 2017 | 15 Jun 2017 | 000-21467 |
| 4 | Open Document | Open Filing | FORM 4 | 15 Aug 2016 | 12 Aug 2016 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 17 Jun 2016 | 16 Jun 2016 | 000-21467 |
| 4 | Open Document | Open Filing | FORM 4 | 18 Nov 2015 | 17 Nov 2015 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 12 Jun 2015 | 11 Jun 2015 | 000-21467 |
| 4 | Open Document | Open Filing | FORM 4 | 20 Aug 2014 | 18 Aug 2014 | 000-21467 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 20 Jun 2014 | 18 Jun 2014 | 000-21467 |