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| year | consumption | change |
| 1986 | 6.80 | NA |
| 1987 | 6.70 | -1.47% |
| 1988 | 8.70 | 29.85% |
| 1989 | 7.20 | -17.24% |
| 1990 | 7.50 | 4.17% |
| 1991 | 7.80 | 4.00% |
| 1992 | 14.00 | 79.49% |
| 1993 | 15.00 | 7.14% |
| 1994 | 15.00 | 0.00% |
| 1995 | 15.00 | 0.00% |
| 1996 | 15.00 | 0.00% |
| 1997 | 15.00 | 0.00% |
| 1998 | 16.00 | 6.67% |
| 1999 | 15.00 | -6.25% |
| 2000 | 36.00 | 140.00% |
| 2001 | 18.00 | -50.00% |
| 2002 | 18.00 | 0.00% |
| 2003 | 19.00 | 5.56% |
| 2004 | 19.00 | 0.00% |
| 2005 | 20.00 | 5.26% |
| 2006 | 20.00 | 0.00% |
| 2007 | 21.00 | 5.00% |
| 2008 | 21.00 | 0.00% |
| 2009 | 22.00 | 4.76% |
| 2010 | 41.00 | 86.36% |
| 2011 | 44.00 | 7.32% |
| 2012 | 44.00 | 0.00% |
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