| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) | 
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 23, 2025 | May 21, 2025 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 5, 2025 | May 1, 2025 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2024 | May 1, 2024 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 29, 2024 | Apr 25, 2024 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 23, 2023 | Aug 21, 2023 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 2, 2023 | May 1, 2023 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 30, 2022 | Jun 28, 2022 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2022 | May 1, 2022 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 21, 2021 | May 19, 2021 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 4, 2021 | May 1, 2021 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 29, 2020 | May 27, 2020 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 5, 2020 | May 1, 2020 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2019 | May 1, 2019 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 29, 2019 | Apr 25, 2019 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 3, 2018 | May 1, 2018 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 27, 2018 | Apr 26, 2018 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 16, 2018 | Mar 14, 2018 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 5, 2017 | May 4, 2017 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 6, 2016 | May 5, 2016 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 1, 2015 | Apr 29, 2015 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 13, 2014 | Nov 11, 2014 | 001-06961 | 
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 5, 2014 | May 1, 2014 | 001-06961 |