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| year | consumption | change |
| 1986 | 2.70 | NA |
| 1987 | 2.20 | -18.52% |
| 1988 | 2.60 | 18.18% |
| 1989 | 2.40 | -7.69% |
| 1990 | 2.70 | 12.50% |
| 1991 | 3.00 | 11.11% |
| 1992 | 3.00 | 0.00% |
| 1993 | 3.00 | 0.00% |
| 1994 | 3.00 | 0.00% |
| 1995 | 3.00 | 0.00% |
| 1996 | 3.00 | 0.00% |
| 1997 | 3.00 | 0.00% |
| 1998 | 2.90 | -3.33% |
| 1999 | 3.60 | 24.14% |
| 2000 | 4.40 | 22.22% |
| 2001 | 5.60 | 27.27% |
| 2002 | 5.40 | -3.57% |
| 2003 | 7.30 | 35.19% |
| 2004 | 9.40 | 28.77% |
| 2005 | 9.90 | 5.32% |
| 2006 | 9.10 | -8.08% |
| 2007 | 8.10 | -10.99% |
| 2008 | 6.80 | -16.05% |
| 2009 | 4.20 | -38.24% |
| 2010 | 4.20 | 0.00% |
| 2011 | 4.20 | 0.00% |
| 2012 | 4.20 | 0.00% |
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