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| year | consumption | change |
| 1986 | 1.80 | NA |
| 1987 | 1.70 | -5.56% |
| 1988 | 2.00 | 17.65% |
| 1989 | 2.60 | 30.00% |
| 1990 | 5.10 | 96.15% |
| 1991 | 4.90 | -3.92% |
| 1992 | 3.40 | -30.61% |
| 1993 | 2.20 | -35.29% |
| 1994 | 2.60 | 18.18% |
| 1995 | 3.10 | 19.23% |
| 1996 | 5.70 | 83.87% |
| 1997 | 5.90 | 3.51% |
| 1998 | 5.70 | -3.39% |
| 1999 | 6.10 | 7.02% |
| 2000 | 6.90 | 13.11% |
| 2001 | 8.20 | 18.84% |
| 2002 | 9.70 | 18.29% |
| 2003 | 10.00 | 3.09% |
| 2004 | 15.00 | 50.00% |
| 2005 | 16.00 | 6.67% |
| 2006 | 19.00 | 18.75% |
| 2007 | 21.00 | 10.53% |
| 2008 | 20.00 | -4.76% |
| 2009 | 16.00 | -20.00% |
| 2010 | 17.00 | 6.25% |
| 2011 | 18.00 | 5.88% |
| 2012 | 19.00 | 5.56% |
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