| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 26, 2021 | Jul 23, 2021 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 10, 2020 | Aug 7, 2020 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 31, 2020 | Jul 29, 2020 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 6, 2019 | Aug 5, 2019 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 1, 2019 | Jul 31, 2019 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 4, 2018 | Aug 31, 2018 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 26, 2018 | Jul 25, 2018 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 1, 2017 | Jul 31, 2017 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 27, 2017 | Jul 26, 2017 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 1, 2016 | Aug 1, 2016 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 28, 2016 | Jul 27, 2016 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 4, 2015 | Aug 4, 2015 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 31, 2015 | Jul 29, 2015 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 6, 2014 | Aug 5, 2014 | 001-13252 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jul 31, 2014 | Jul 30, 2014 | 001-13252 |