| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 8, 2022 | Nov 8, 2022 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 9, 2022 | Aug 8, 2022 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 11, 2022 | May 10, 2022 | 000-31641 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 9, 2022 | Feb 8, 2022 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 10, 2021 | Nov 9, 2021 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 10, 2021 | Aug 9, 2021 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 10, 2021 | May 7, 2021 | 000-31641 |
| 4/A | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 26, 2021 | Mar 20, 2019 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 10, 2021 | Feb 9, 2021 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 9, 2020 | Nov 9, 2020 | 000-31641 |
| 4 | Open Document | Open Filing | FORM 4 | Aug 7, 2020 | Aug 7, 2020 | 000-31641 |
| 4 | Open Document | Open Filing | FORM 4 | May 7, 2020 | May 7, 2020 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 10, 2020 | Feb 7, 2020 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 7, 2019 | Nov 7, 2019 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 6, 2019 | Aug 6, 2019 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 7, 2019 | May 7, 2019 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 22, 2019 | Mar 20, 2019 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 8, 2019 | Feb 7, 2019 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 8, 2018 | Nov 7, 2018 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 7, 2018 | Aug 7, 2018 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 8, 2018 | May 8, 2018 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 8, 2018 | Feb 7, 2018 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 17, 2017 | Nov 16, 2017 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 8, 2017 | Nov 7, 2017 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 8, 2017 | Aug 7, 2017 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Jun 15, 2017 | Jun 14, 2017 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 9, 2017 | May 9, 2017 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Mar 20, 2017 | Mar 17, 2017 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 7, 2017 | Feb 7, 2017 | 000-31641 |
| 144 | Open Document | Open Filing | FORM 144 | Dec 2, 2016 | ||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 8, 2016 | Nov 7, 2016 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Oct 7, 2016 | Oct 6, 2016 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Sep 19, 2016 | Jul 6, 2016 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 16, 2016 | Aug 15, 2016 | 000-31641 |
| 4 | Open Document | Open Filing | FORM 4 | May 20, 2016 | May 19, 2016 | 000-31641 |
| 144 | Open Document | Open Filing | 144 | May 12, 2016 | ||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 12, 2016 | May 11, 2016 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | May 5, 2016 | May 3, 2016 | 000-31641 |
| 144 | Open Document | Open Filing | 144 | May 5, 2016 | ||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 17, 2016 | Feb 16, 2016 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 17, 2015 | Nov 16, 2015 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 18, 2015 | Aug 17, 2015 | 000-31641 |
| 4 | Open Document | Open Filing | FORM 4 | May 19, 2015 | May 15, 2015 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 18, 2015 | Feb 17, 2015 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Nov 18, 2014 | Nov 17, 2014 | 000-31641 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Aug 18, 2014 | Aug 15, 2014 | 000-31641 |
| 4 | Open Document | Open Filing | FORM 4 | May 16, 2014 | May 15, 2014 | 000-31641 |
| 4 | Open Document | Open Filing | FORM 4 | Feb 20, 2014 | Feb 18, 2014 | 000-31641 |