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| year | consumption | change |
| 1986 | 5.00 | NA |
| 1987 | 3.20 | -36.00% |
| 1988 | 3.30 | 3.13% |
| 1989 | 4.00 | 21.21% |
| 1990 | 3.80 | -5.00% |
| 1991 | 3.90 | 2.63% |
| 1992 | 4.10 | 5.13% |
| 1993 | 4.00 | -2.44% |
| 1994 | 4.70 | 17.50% |
| 1995 | 4.20 | -10.64% |
| 1996 | 17.00 | 304.76% |
| 1997 | 7.80 | -54.12% |
| 1998 | 4.30 | -44.87% |
| 1999 | 4.40 | 2.33% |
| 2000 | 4.70 | 6.82% |
| 2001 | 4.70 | 0.00% |
| 2002 | 4.60 | -2.13% |
| 2003 | 4.80 | 4.35% |
| 2004 | 6.20 | 29.17% |
| 2005 | 6.30 | 1.61% |
| 2006 | 5.20 | -17.46% |
| 2007 | 5.50 | 5.77% |
| 2008 | 5.60 | 1.82% |
| 2009 | 7.00 | 25.00% |
| 2010 | 7.60 | 8.57% |
| 2011 | 3.00 | -60.53% |
| 2012 | 8.30 | 176.67% |
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