| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 17 May 2022 | 16 May 2022 | 001-08351 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 18 May 2021 | 17 May 2021 | 001-08351 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 19 May 2020 | 18 May 2020 | 001-08351 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 22 May 2019 | 20 May 2019 | 001-08351 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 23 May 2018 | 21 May 2018 | 001-08351 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 16 May 2017 | 15 May 2017 | 001-08351 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 02 Jun 2016 | 31 May 2016 | 000-22248 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 17 May 2016 | 16 May 2016 | 001-08351 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 23 Jul 2015 | 21 Jul 2015 | 000-22248 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 19 May 2015 | 18 May 2015 | 001-08351 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 16 Jul 2014 | 15 Jul 2014 | 000-22248 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 20 May 2014 | 19 May 2014 | 001-08351 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 14 May 2014 | 12 May 2014 | 000-22248 |