| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 20 May 2021 | 18 May 2021 | 001-12139 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 26 May 2020 | 21 May 2020 | 001-12139 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 17 Mar 2020 | 16 Mar 2020 | 001-12139 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 20 May 2019 | 16 May 2019 | 001-12139 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 May 2018 | 17 May 2018 | 001-12139 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 22 May 2017 | 18 May 2017 | 001-12139 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 23 May 2016 | 19 May 2016 | 001-12139 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 04 Aug 2015 | 03 Aug 2015 | 001-12139 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 18 May 2015 | 14 May 2015 | 001-12139 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | 14 May 2015 | 14 May 2015 | 001-12139 |