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| year | consumption | change |
| 1986 | 1.70 | NA |
| 1987 | 1.40 | -17.65% |
| 1988 | 1.40 | 0.00% |
| 1989 | 3.50 | 150.00% |
| 1990 | 4.30 | 22.86% |
| 1991 | 4.70 | 9.30% |
| 1992 | 5.20 | 10.64% |
| 1993 | 2.90 | -44.23% |
| 1994 | 3.30 | 13.79% |
| 1995 | 3.10 | -6.06% |
| 1996 | 2.80 | -9.68% |
| 1997 | 3.30 | 17.86% |
| 1998 | 3.40 | 3.03% |
| 1999 | 1.40 | -58.82% |
| 2000 | 1.50 | 7.14% |
| 2001 | 1.50 | 0.00% |
| 2002 | 1.50 | 0.00% |
| 2003 | 1.50 | 0.00% |
| 2004 | 1.70 | 13.33% |
| 2005 | 1.50 | -11.76% |
| 2006 | 2.70 | 80.00% |
| 2007 | 3.20 | 18.52% |
| 2008 | 2.20 | -31.25% |
| 2009 | 3.10 | 40.91% |
| 2010 | 6.40 | 106.45% |
| 2011 | 3.80 | -40.63% |
| 2012 | 3.90 | 2.63% |
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