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| year | consumption | change |
| 1986 | 2.50 | NA |
| 1987 | 2.90 | 16.00% |
| 1988 | 3.40 | 17.24% |
| 1989 | 4.00 | 17.65% |
| 1990 | 3.90 | -2.50% |
| 1991 | 3.00 | -23.08% |
| 1992 | 2.90 | -3.33% |
| 1993 | 3.60 | 24.14% |
| 1994 | 5.20 | 44.44% |
| 1995 | 5.20 | 0.00% |
| 1996 | 5.40 | 3.85% |
| 1997 | 3.20 | -40.74% |
| 1998 | 6.70 | 109.38% |
| 1999 | 6.50 | -2.99% |
| 2000 | 9.60 | 47.69% |
| 2001 | 7.80 | -18.75% |
| 2002 | 7.60 | -2.56% |
| 2003 | 5.80 | -23.68% |
| 2004 | 7.40 | 27.59% |
| 2005 | 8.50 | 14.86% |
| 2006 | 9.40 | 10.59% |
| 2007 | 9.70 | 3.19% |
| 2008 | 5.20 | -46.39% |
| 2009 | 7.10 | 36.54% |
| 2010 | 6.70 | -5.63% |
| 2011 | 5.70 | -14.93% |
| 2012 | 6.50 | 14.04% |
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