| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 23, 2025 | Apr 21, 2025 | 001-16497 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 3, 2024 | Apr 1, 2023 | 001-16497 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 29, 2023 | Mar 27, 2023 | 001-16497 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 4, 2022 | Mar 28, 2022 | 001-16497 |
| 4/A | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 5, 2021 | Mar 29, 2021 | 001-16497 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 31, 2021 | Mar 29, 2021 | 001-16497 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 20, 2020 | Apr 16, 2020 | 001-16497 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Oct 28, 2019 | Sep 24, 2019 | 001-16497 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 19, 2019 | Apr 17, 2019 | 001-16497 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 18, 2018 | Apr 16, 2018 | 001-16497 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 19, 2017 | Apr 17, 2017 | 001-16497 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 19, 2016 | Apr 15, 2016 | 001-16497 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 20, 2015 | Apr 15, 2015 | 001-16497 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Sep 16, 2014 | Sep 12, 2014 | 001-16497 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 17, 2014 | Apr 15, 2014 | 001-16497 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 20, 2014 | Feb 20, 2014 | 001-16497 |