|
| 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Butane energy | 1920 | 2040 | 2190 | 2500 | 2720 | 2930 | 2990 | 3220 | 3250 | 3550 |
| Oil energy | 5600 | 5780 | 6710 | 6350 | 5600 | 5660 | 5340 | 5180 | 5180 | 5240 |
| Total energy | 7520 | 7820 | 8900 | 8850 | 8320 | 8590 | 8330 | 8400 | 8430 | 8790 |
| Total exergy | 7898.30 | 8210.40 | 9355.10 | 9279.90 | 8698 | 8965.70 | 8683.90 | 8741.10 | 8770.60 | 9132.50 |