| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | 18 May 2021 | 16 May 2021 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 15 Mar 2021 | 11 Mar 2021 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 09 Mar 2021 | 08 Mar 2021 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 08 Feb 2021 | 05 Feb 2021 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 05 Jan 2021 | 02 Jan 2021 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 08 Jun 2020 | 04 Jun 2020 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 13 Mar 2020 | 11 Mar 2020 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 06 Jan 2020 | 02 Jan 2020 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 16 Sep 2019 | 13 Sep 2019 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 12 Jun 2019 | 10 Jun 2019 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 10 Jun 2019 | 07 Jun 2019 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 21 May 2019 | 20 May 2019 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 12 Mar 2019 | 11 Mar 2019 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 20 Feb 2019 | 18 Feb 2019 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 04 Jan 2019 | 02 Jan 2019 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 15 Jun 2018 | 14 Jun 2018 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 22 May 2018 | 20 May 2018 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 22 Jan 2018 | 18 Jan 2018 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 05 Jan 2018 | 04 Jan 2018 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 03 Jan 2018 | 02 Jan 2018 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 11 Sep 2017 | 08 Sep 2017 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 14 Aug 2017 | 13 Aug 2017 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 07 Jun 2017 | 06 Jun 2017 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 22 May 2017 | 20 May 2017 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 15 Mar 2017 | 10 Mar 2017 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 13 Mar 2017 | 10 Mar 2017 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 05 Jan 2017 | 04 Jan 2017 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 03 Jan 2017 | 02 Jan 2017 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 15 Aug 2016 | 12 Aug 2016 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 13 Jun 2016 | 13 Jun 2016 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 23 May 2016 | 20 May 2016 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 05 Jan 2016 | 02 Jan 2016 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 14 Aug 2015 | 13 Aug 2015 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 27 May 2015 | 26 May 2015 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 21 May 2015 | 20 May 2015 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 05 Jan 2015 | 02 Jan 2015 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 06 Nov 2014 | 04 Nov 2014 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 15 Aug 2014 | 13 Aug 2014 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 21 May 2014 | 20 May 2014 | 000-18953 |
| 4 | Open Document | Open Filing | FORM 4 | 19 Mar 2014 | 06 Aug 2013 | 000-18953 |