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| year | consumption | change |
| 1986 | 3.00 | NA |
| 1987 | 3.30 | 10.00% |
| 1988 | 3.70 | 12.12% |
| 1989 | 3.70 | 0.00% |
| 1990 | 3.60 | -2.70% |
| 1991 | 3.80 | 5.56% |
| 1992 | 4.00 | 5.26% |
| 1993 | 4.10 | 2.50% |
| 1994 | 4.20 | 2.44% |
| 1995 | 4.20 | 0.00% |
| 1996 | 4.10 | -2.38% |
| 1997 | 4.20 | 2.44% |
| 1998 | 4.50 | 7.14% |
| 1999 | 4.70 | 4.44% |
| 2000 | 4.90 | 4.26% |
| 2001 | 5.50 | 12.24% |
| 2002 | 5.30 | -3.64% |
| 2003 | 6.60 | 24.53% |
| 2004 | 6.60 | 0.00% |
| 2005 | 7.80 | 18.18% |
| 2006 | 7.50 | -3.85% |
| 2007 | 8.10 | 8.00% |
| 2008 | 8.90 | 9.88% |
| 2009 | 8.80 | -1.12% |
| 2010 | 9.20 | 4.55% |
| 2011 | 8.80 | -4.35% |
| 2012 | 8.50 | -3.41% |
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