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| year | consumption | change |
| 1986 | 1.80 | NA |
| 1987 | 3.20 | 77.78% |
| 1988 | 3.40 | 6.25% |
| 1989 | 2.90 | -14.71% |
| 1990 | 3.20 | 10.34% |
| 1991 | 3.40 | 6.25% |
| 1992 | 2.00 | -41.18% |
| 1993 | 2.70 | 35.00% |
| 1994 | 3.00 | 11.11% |
| 1995 | 3.30 | 10.00% |
| 1996 | 2.20 | -33.33% |
| 1997 | 2.10 | -4.55% |
| 1998 | 2.60 | 23.81% |
| 1999 | 2.60 | 0.00% |
| 2000 | 2.80 | 7.69% |
| 2001 | 3.50 | 25.00% |
| 2002 | 3.40 | -2.86% |
| 2003 | 3.90 | 14.71% |
| 2004 | 4.60 | 17.95% |
| 2005 | 4.60 | 0.00% |
| 2006 | 6.60 | 43.48% |
| 2007 | 7.50 | 13.64% |
| 2008 | 8.10 | 8.00% |
| 2009 | 8.80 | 8.64% |
| 2010 | 7.30 | -17.05% |
| 2011 | 6.60 | -9.59% |
| 2012 | 6.50 | -1.52% |
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