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| year | consumption | change |
| 1986 | 4.20 | NA |
| 1987 | 4.40 | 4.76% |
| 1988 | 3.90 | -11.36% |
| 1989 | 4.30 | 10.26% |
| 1990 | 4.30 | 0.00% |
| 1991 | 4.20 | -2.33% |
| 1992 | 2.80 | -33.33% |
| 1993 | 2.90 | 3.57% |
| 1994 | 3.10 | 6.90% |
| 1995 | 3.00 | -3.23% |
| 1996 | 2.90 | -3.33% |
| 1997 | 2.90 | 0.00% |
| 1998 | 3.30 | 13.79% |
| 1999 | 3.10 | -6.06% |
| 2000 | 4.10 | 32.26% |
| 2001 | 4.60 | 12.20% |
| 2002 | 4.70 | 2.17% |
| 2003 | 5.60 | 19.15% |
| 2004 | 5.70 | 1.79% |
| 2005 | 6.10 | 7.02% |
| 2006 | 5.30 | -13.11% |
| 2007 | 3.50 | -33.96% |
| 2008 | 3.60 | 2.86% |
| 2009 | 3.80 | 5.56% |
| 2010 | 4.10 | 7.89% |
| 2011 | 3.70 | -9.76% |
| 2012 | 3.70 | 0.00% |
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