| Views | |
| Sustainability Conference, 2009 | 1197 |
| November 2012 | December 2012 | January 2013 | February 2013 | March 2013 | April 2013 | May 2013 | |
| Sustainability Conference, 2009 | 22 | 43 | 23 | 17 | 17 | 19 | 12 |
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