| Symbol | Relationship | Date | Transaction | Cost | # Shares | Value($) | Total Shares | Form 4 |
| CEN | CFO, CCO, Treasurer | Apr 24, 2015 | Buy | $15.38 | 8,334 | 128,177 | 33,334 | Apr 27, 2015, 12:11 PM |
| CEN | Treasurer | Sep 23, 2014 | Buy | $19.07 | 5,000 | 95,341 | 25,000 | Sep 24, 2014, 11:49 AM |
| CEN | Treasurer | Jul 31, 2014 | Buy | $18.82 | 5,000 | 94,100 | 20,000 | Aug 01, 2014, 04:40 PM |
| CEN | Treasurer | Mar 12, 2014 | Buy | $17.14 | 2,500 | 42,860 | 15,000 | Mar 12, 2014, 04:55 PM |
| CEN | Treasurer | Feb 19, 2014 | Buy | $17.12 | 2,500 | 42,800 | 12,500 | Feb 19, 2014, 03:54 PM |
| CEN | Treasurer | Dec 31, 2013 | Buy | $18.02 | 2,500 | 45,050 | 10,000 | Dec 31, 2013, 02:57 PM |
| CEN | Treasurer | Nov 21, 2013 | Buy | $17.95 | 1,500 | 26,925 | 7,500 | Nov 22, 2013, 02:56 PM |
| CEN | Treasurer | Nov 14, 2013 | Buy | $19.08 | 6,000 | 114,475 | 6,000 | Nov 15, 2013, 03:22 PM |
| Symbol | Relationship | Date | Transaction | Value($) |
| CEN | CFO, CCO, Treasurer | Apr 24, 2015 | Buy | 128,177 |
| CEN | Treasurer | Sep 23, 2014 | Buy | 95,341 |
| CEN | Treasurer | Jul 31, 2014 | Buy | 94,100 |
| CEN | Treasurer | Mar 12, 2014 | Buy | 42,860 |
| CEN | Treasurer | Feb 19, 2014 | Buy | 42,800 |
| CEN | Treasurer | Dec 31, 2013 | Buy | 45,050 |
| CEN | Treasurer | Nov 21, 2013 | Buy | 26,925 |
| CEN | Treasurer | Nov 14, 2013 | Buy | 114,475 |