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| year | consumption | change |
| 1986 | 1.80 | NA |
| 1987 | 2.00 | 11.11% |
| 1988 | 1.90 | -5.00% |
| 1989 | 1.90 | 0.00% |
| 1990 | 2.10 | 10.53% |
| 1991 | 2.20 | 4.76% |
| 1992 | 2.20 | 0.00% |
| 1993 | 2.30 | 4.55% |
| 1994 | 2.40 | 4.35% |
| 1995 | 1.70 | -29.17% |
| 1996 | 2.20 | 29.41% |
| 1997 | 2.90 | 31.82% |
| 1998 | 3.10 | 6.90% |
| 1999 | 3.20 | 3.23% |
| 2000 | 3.30 | 3.13% |
| 2001 | 3.30 | 0.00% |
| 2002 | 3.20 | -3.03% |
| 2003 | 4.10 | 28.13% |
| 2004 | 6.20 | 51.22% |
| 2005 | 3.70 | -40.32% |
| 2006 | 3.70 | 0.00% |
| 2007 | 4.10 | 10.81% |
| 2008 | 4.30 | 4.88% |
| 2009 | 4.90 | 13.95% |
| 2010 | 9.30 | 89.80% |
| 2011 | 7.60 | -18.28% |
| 2012 | 7.80 | 2.63% |
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