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| year | consumption | change |
| 1986 | 3.00 | NA |
| 1987 | 5.80 | 93.33% |
| 1988 | 5.40 | -6.90% |
| 1989 | 4.60 | -14.81% |
| 1990 | 5.60 | 21.74% |
| 1991 | 5.70 | 1.79% |
| 1992 | 6.00 | 5.26% |
| 1993 | 6.40 | 6.67% |
| 1994 | 6.90 | 7.81% |
| 1995 | 5.00 | -27.54% |
| 1996 | 7.90 | 58.00% |
| 1997 | 9.20 | 16.46% |
| 1998 | 9.80 | 6.52% |
| 1999 | 1.70 | -82.65% |
| 2000 | 8.60 | 405.88% |
| 2001 | 8.60 | 0.00% |
| 2002 | 1.30 | -84.88% |
| 2003 | 1.50 | 15.38% |
| 2004 | 2.10 | 40.00% |
| 2005 | 5.40 | 157.14% |
| 2006 | 8.80 | 62.96% |
| 2007 | 11.00 | 25.00% |
| 2008 | 13.00 | 18.18% |
| 2009 | 2.80 | -78.46% |
| 2010 | 11.00 | 292.86% |
| 2011 | 11.00 | 0.00% |
| 2012 | 12.00 | 9.09% |
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