| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 18 May 2021 | 14 May 2021 | 001-03754 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 19 May 2020 | 15 May 2020 | 001-03754 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 17 May 2019 | 15 May 2019 | 001-03754 |
| 4 | Open Document | Open Filing | FORM 4 | 17 May 2018 | 15 May 2018 | 001-03754 |
| 4 | Open Document | Open Filing | FORM 4 | 17 May 2017 | 15 May 2017 | 001-03754 |
| 4 | Open Document | Open Filing | FORM 4 | 25 Jul 2016 | 21 Jul 2016 | 001-03754 |
| 4 | Open Document | Open Filing | FORM 4 | 05 May 2016 | 03 May 2016 | 001-03754 |
| 4 | Open Document | Open Filing | FORM 4 | 01 Jun 2015 | 28 May 2015 | 001-03754 |
| 4 | Open Document | Open Filing | FORM 4 | 21 Jul 2014 | 17 Jul 2014 | 001-03754 |
| 3 | Open Document | Open Filing | FORM 3 | 18 Jul 2014 | 17 Jul 2014 | 001-03754 |