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| year | consumption | change |
| 1986 | 2.80 | NA |
| 1987 | 5.60 | 100.00% |
| 1988 | 5.20 | -7.14% |
| 1989 | 5.20 | 0.00% |
| 1990 | 3.50 | -32.69% |
| 1991 | 6.20 | 77.14% |
| 1992 | 6.50 | 4.84% |
| 1993 | 6.90 | 6.15% |
| 1994 | 9.00 | 30.43% |
| 1995 | 4.20 | -53.33% |
| 1996 | 3.90 | -7.14% |
| 1997 | 4.30 | 10.26% |
| 1998 | 4.80 | 11.63% |
| 1999 | 33.00 | 587.50% |
| 2000 | 32.00 | -3.03% |
| 2001 | 36.00 | 12.50% |
| 2002 | 36.00 | 0.00% |
| 2003 | 38.00 | 5.56% |
| 2004 | 39.00 | 2.63% |
| 2005 | 23.00 | -41.03% |
| 2006 | 4.80 | -79.13% |
| 2007 | 7.80 | 62.50% |
| 2008 | 8.50 | 8.97% |
| 2009 | 5.40 | -36.47% |
| 2010 | 67.00 | 1,140.74% |
| 2011 | 67.00 | 0.00% |
| 2012 | 75.00 | 11.94% |
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