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| year | consumption | change |
| 1986 | 7.00 | NA |
| 1987 | 7.60 | 8.57% |
| 1988 | 9.20 | 21.05% |
| 1989 | 10.00 | 8.70% |
| 1990 | 11.00 | 10.00% |
| 1991 | 12.00 | 9.09% |
| 1992 | 14.00 | 16.67% |
| 1993 | 14.00 | 0.00% |
| 1994 | 16.00 | 14.29% |
| 1995 | 18.00 | 12.50% |
| 1996 | 18.00 | 0.00% |
| 1997 | 20.00 | 11.11% |
| 1998 | 17.00 | -15.00% |
| 1999 | 20.00 | 17.65% |
| 2000 | 21.00 | 5.00% |
| 2001 | 22.00 | 4.76% |
| 2002 | 20.00 | -9.09% |
| 2003 | 22.00 | 10.00% |
| 2004 | 22.00 | 0.00% |
| 2005 | 23.00 | 4.55% |
| 2006 | 21.00 | -8.70% |
| 2007 | 32.00 | 52.38% |
| 2008 | 33.00 | 3.13% |
| 2009 | 31.00 | -6.06% |
| 2010 | 33.00 | 6.45% |
| 2011 | 32.00 | -3.03% |
| 2012 | 33.00 | 3.13% |
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