| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 11 May 2022 | 09 May 2022 | 000-26966 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 04 May 2021 | 30 Apr 2021 | 000-26966 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 04 May 2020 | 30 Apr 2020 | 000-26966 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 06 Jun 2019 | 04 Jun 2019 | 000-26966 |
| 4/A | Open Document | Open Filing | FORM 4/A SUBMISSION | 15 Nov 2018 | 03 May 2018 | 000-26966 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 07 May 2018 | 03 May 2018 | 000-26966 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 05 Jun 2017 | 02 Jun 2017 | 000-26966 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 08 May 2017 | 04 May 2017 | 000-26966 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | 17 May 2016 | 12 May 2016 | 000-12853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 16 May 2016 | 12 May 2016 | 000-12853 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 06 May 2016 | 05 May 2016 | 000-26966 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 Aug 2015 | 03 Aug 2015 | 000-12853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 18 May 2015 | 14 May 2015 | 000-12853 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 11 May 2015 | 07 May 2015 | 000-26966 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 Feb 2015 | 30 Jan 2015 | 000-12853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 16 Dec 2014 | 15 Dec 2014 | 000-12853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 20 Nov 2014 | 18 Nov 2014 | 000-12853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 15 Sep 2014 | 12 Sep 2014 | 000-12853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 12 Jun 2014 | 10 Jun 2014 | 000-12853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 16 May 2014 | 15 May 2014 | 000-12853 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 14 May 2014 | 13 May 2014 | 000-16454 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 09 May 2014 | 07 May 2014 | 000-26966 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 14 Mar 2014 | 13 Mar 2014 | 000-12853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 26 Feb 2014 | 23 Feb 2014 | 000-12853 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 05 Feb 2014 | 04 Feb 2014 | 000-26966 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 16 Jan 2014 | 16 Jan 2014 | 000-26966 |
| 5 | Open Document | Open Filing | FORM 5 SUBMISSION | 03 Jan 2014 | 31 Dec 2013 | 000-26966 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 05 Dec 2013 | 04 Dec 2013 | 000-12853 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 18 Nov 2013 | 14 Nov 2013 | 000-16454 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 07 Nov 2013 | 05 Nov 2013 | 000-26966 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 30 Oct 2013 | 29 Oct 2013 | 000-26966 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 04 Sep 2013 | 03 Sep 2013 | 000-12853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Jun 2013 | 19 Jun 2013 | 000-12853 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 18 Jun 2013 | 14 Jun 2013 | 000-16454 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 May 2013 | 09 May 2013 | 000-12853 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 02 May 2013 | 01 May 2013 | 000-26966 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 15 Mar 2013 | 14 Mar 2013 | 000-12853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 28 Dec 2012 | 27 Dec 2012 | 000-12853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 07 Dec 2012 | 05 Dec 2012 | 000-12853 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 05 Dec 2012 | 02 May 2012 | 000-26966 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 12 Sep 2012 | 10 Sep 2012 | 000-12853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 20 Jun 2012 | 18 Jun 2012 | 000-12853 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 11 Jun 2012 | 01 Jun 2012 | 000-16454 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 11 May 2012 | 10 May 2012 | 000-12853 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Feb 2012 | 17 Feb 2012 | 000-12853 |