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| year | consumption | change |
| 1986 | 7.60 | NA |
| 1987 | 17.00 | 123.68% |
| 1988 | 20.00 | 17.65% |
| 1989 | 18.00 | -10.00% |
| 1990 | 18.00 | 0.00% |
| 1991 | 14.00 | -22.22% |
| 1992 | 19.00 | 35.71% |
| 1993 | 13.00 | -31.58% |
| 1994 | 8.80 | -32.31% |
| 1995 | 14.00 | 59.09% |
| 1996 | 5.70 | -59.29% |
| 1997 | 7.40 | 29.82% |
| 1998 | 8.50 | 14.86% |
| 1999 | 9.80 | 15.29% |
| 2000 | 11.00 | 12.24% |
| 2001 | 13.00 | 18.18% |
| 2002 | 14.00 | 7.69% |
| 2003 | 8.90 | -36.43% |
| 2004 | 7.70 | -13.48% |
| 2005 | 9.90 | 28.57% |
| 2006 | 11.00 | 11.11% |
| 2007 | 18.00 | 63.64% |
| 2008 | 3.10 | -82.78% |
| 2009 | 6.70 | 116.13% |
| 2010 | 8.60 | 28.36% |
| 2011 | 7.70 | -10.47% |
| 2012 | 17.00 | 120.78% |
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