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| year | consumption | change |
| 1986 | 3.60 | NA |
| 1987 | 3.40 | -5.56% |
| 1988 | 3.70 | 8.82% |
| 1989 | 6.60 | 78.38% |
| 1990 | 6.50 | -1.52% |
| 1991 | 6.00 | -7.69% |
| 1992 | 5.50 | -8.33% |
| 1993 | 5.30 | -3.64% |
| 1994 | 5.40 | 1.89% |
| 1995 | 5.30 | -1.85% |
| 1996 | 5.50 | 3.77% |
| 1997 | 2.60 | -52.73% |
| 1998 | 2.60 | 0.00% |
| 1999 | 2.70 | 3.85% |
| 2000 | 3.20 | 18.52% |
| 2001 | 3.70 | 15.63% |
| 2002 | 4.00 | 8.11% |
| 2003 | 3.90 | -2.50% |
| 2004 | 5.30 | 35.90% |
| 2005 | 5.50 | 3.77% |
| 2006 | 6.30 | 14.55% |
| 2007 | 7.70 | 22.22% |
| 2008 | 8.70 | 12.99% |
| 2009 | 8.50 | -2.30% |
| 2010 | 10.00 | 17.65% |
| 2011 | 13.00 | 30.00% |
| 2012 | 15.00 | 15.38% |
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