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| year | consumption | change |
| 1986 | 1.90 | NA |
| 1987 | 2.30 | 21.05% |
| 1988 | 1.80 | -21.74% |
| 1989 | 3.60 | 100.00% |
| 1990 | 1.80 | -50.00% |
| 1991 | 1.40 | -22.22% |
| 1992 | 3.60 | 157.14% |
| 1993 | 3.00 | -16.67% |
| 1994 | 5.90 | 96.67% |
| 1995 | 6.30 | 6.78% |
| 1996 | 3.30 | -47.62% |
| 1997 | 3.40 | 3.03% |
| 1998 | 2.20 | -35.29% |
| 1999 | 2.00 | -9.09% |
| 2000 | 3.50 | 75.00% |
| 2001 | 2.00 | -42.86% |
| 2002 | 1.90 | -5.00% |
| 2003 | 8.00 | 321.05% |
| 2004 | 8.00 | 0.00% |
| 2005 | 8.60 | 7.50% |
| 2006 | 5.60 | -34.88% |
| 2007 | 3.20 | -42.86% |
| 2008 | 5.40 | 68.75% |
| 2009 | 5.80 | 7.41% |
| 2010 | 4.50 | -22.41% |
| 2011 | 5.10 | 13.33% |
| 2012 | 7.40 | 45.10% |
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