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| year | consumption | change |
| 1986 | 1.60 | NA |
| 1987 | 2.90 | 81.25% |
| 1988 | 1.50 | -48.28% |
| 1989 | 5.30 | 253.33% |
| 1990 | 5.30 | 0.00% |
| 1991 | 5.00 | -5.66% |
| 1992 | 5.30 | 6.00% |
| 1993 | 4.80 | -9.43% |
| 1994 | 5.50 | 14.58% |
| 1995 | 2.50 | -54.55% |
| 1996 | 2.10 | -16.00% |
| 1997 | 2.00 | -4.76% |
| 1998 | 2.60 | 30.00% |
| 1999 | 5.40 | 107.69% |
| 2000 | 2.60 | -51.85% |
| 2001 | 1.30 | -50.00% |
| 2002 | 2.70 | 107.69% |
| 2003 | 2.00 | -25.93% |
| 2004 | 2.10 | 5.00% |
| 2005 | 2.10 | 0.00% |
| 2006 | 2.70 | 28.57% |
| 2007 | 3.30 | 22.22% |
| 2008 | 4.10 | 24.24% |
| 2009 | 3.50 | -14.63% |
| 2010 | 3.70 | 5.71% |
| 2011 | 3.50 | -5.41% |
| 2012 | 3.40 | -2.86% |
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