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| year | consumption | change |
| 1986 | 16.00 | NA |
| 1987 | 21.00 | 31.25% |
| 1988 | 19.00 | -9.52% |
| 1989 | 21.00 | 10.53% |
| 1990 | 24.00 | 14.29% |
| 1991 | 25.00 | 4.17% |
| 1992 | 31.00 | 24.00% |
| 1993 | 28.00 | -9.68% |
| 1994 | 31.00 | 10.71% |
| 1995 | 27.00 | -12.90% |
| 1996 | 27.00 | 0.00% |
| 1997 | 28.00 | 3.70% |
| 1998 | 31.00 | 10.71% |
| 1999 | 23.00 | -25.81% |
| 2000 | 25.00 | 8.70% |
| 2001 | 37.00 | 48.00% |
| 2002 | 46.00 | 24.32% |
| 2003 | 36.00 | -21.74% |
| 2004 | 37.00 | 2.78% |
| 2005 | 44.00 | 18.92% |
| 2006 | 46.00 | 4.55% |
| 2007 | 48.00 | 4.35% |
| 2008 | 44.00 | -8.33% |
| 2009 | 31.00 | -29.55% |
| 2010 | 41.00 | 32.26% |
| 2011 | 45.00 | 9.76% |
| 2012 | 40.00 | -11.11% |
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