| Filed On | Filing |
|---|---|
| 28 Apr 2026 | DEF 14A |
| 25 Apr 2025 | DEF 14A |
| 29 Apr 2024 | DEF 14A |
| 01 May 2023 | DEF 14A |
| 18 May 2022 | DEF 14A |
| 30 Apr 2021 | DEF 14A |
| 15 Jun 2020 | DEF 14A |
| 30 Apr 2019 | DEF 14A |
| 30 Apr 2018 | DEF 14A |
| 01 May 2017 | DEF 14A |
| 29 Apr 2016 | DEF 14A |
| 30 Apr 2015 | DEF 14A |
| 22 Apr 2014 | DEF 14A |
| 29 Apr 2013 | DEF 14A |
| 27 Apr 2012 | NGSG 2011 PROXY |
| 29 Apr 2011 | 2011 PROXY STATEMENT |
| 30 Apr 2010 | NGS DEFINITIVE PROXY STATEMENT 4-29-2010 |
| 27 Apr 2009 | PROXY FOR SHAREHOLDERS MEETING 6-16-2009 |
| 28 Apr 2008 | DEF 14A |
| 10 May 2007 | DEF 14A |
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