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| year | consumption | change |
| 1986 | 6.20 | NA |
| 1987 | 7.00 | 12.90% |
| 1988 | 7.60 | 8.57% |
| 1989 | 9.50 | 25.00% |
| 1990 | 10.00 | 5.26% |
| 1991 | 10.00 | 0.00% |
| 1992 | 11.00 | 10.00% |
| 1993 | 12.00 | 9.09% |
| 1994 | 15.00 | 25.00% |
| 1995 | 14.00 | -6.67% |
| 1996 | 13.00 | -7.14% |
| 1997 | 13.00 | 0.00% |
| 1998 | 14.00 | 7.69% |
| 1999 | 14.00 | 0.00% |
| 2000 | 12.00 | -14.29% |
| 2001 | 11.00 | -8.33% |
| 2002 | 10.00 | -9.09% |
| 2003 | 8.30 | -17.00% |
| 2004 | 8.00 | -3.61% |
| 2005 | 6.40 | -20.00% |
| 2006 | 4.40 | -31.25% |
| 2007 | 9.70 | 120.45% |
| 2008 | 6.40 | -34.02% |
| 2009 | 2.90 | -54.69% |
| 2010 | 3.50 | 20.69% |
| 2011 | 2.70 | -22.86% |
| 2012 | 2.80 | 3.70% |
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