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| year | consumption | change |
| 1986 | 1.20 | NA |
| 1987 | 1.20 | 0.00% |
| 1988 | 1.20 | 0.00% |
| 1989 | 1.30 | 8.33% |
| 1990 | 1.40 | 7.69% |
| 1991 | 1.40 | 0.00% |
| 1992 | 1.40 | 0.00% |
| 1993 | 1.40 | 0.00% |
| 1994 | 1.30 | -7.14% |
| 1995 | 1.30 | 0.00% |
| 1996 | 1.40 | 7.69% |
| 1997 | 1.60 | 14.29% |
| 1998 | 1.70 | 6.25% |
| 1999 | 1.70 | 0.00% |
| 2000 | 1.90 | 11.76% |
| 2001 | 2.00 | 5.26% |
| 2002 | 2.00 | 0.00% |
| 2003 | 2.00 | 0.00% |
| 2004 | 2.10 | 5.00% |
| 2005 | 2.20 | 4.76% |
| 2006 | 2.30 | 4.55% |
| 2007 | 2.30 | 0.00% |
| 2008 | 2.30 | 0.00% |
| 2009 | 2.20 | -4.35% |
| 2010 | 2.20 | 0.00% |
| 2011 | 2.20 | 0.00% |
| 2012 | 2.20 | 0.00% |
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