| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 - | May 21, 2021 | May 19, 2021 | 000-29889 |
| 4 | Open Document | Open Filing | FORM 4 - | May 15, 2020 | May 15, 2020 | 000-29889 |
| 4 | Open Document | Open Filing | FORM 4 - | May 24, 2019 | May 23, 2019 | 000-29889 |
| 4 | Open Document | Open Filing | FORM 4 - | May 18, 2018 | May 17, 2018 | 000-29889 |
| 4 | Open Document | Open Filing | FORM 4 - | May 12, 2017 | May 12, 2017 | 000-29889 |
| 4 | Open Document | Open Filing | FORM 4 - | May 12, 2016 | May 11, 2016 | 000-29889 |
| 4 | Open Document | Open Filing | FORM 4 - | May 14, 2015 | May 13, 2015 | 000-29889 |
| 4 | Open Document | Open Filing | FORM 4 - | May 23, 2014 | May 21, 2014 | 000-29889 |