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| year | consumption | change |
| 1986 | 5.70 | NA |
| 1987 | 8.50 | 49.12% |
| 1988 | 9.20 | 8.24% |
| 1989 | 10.00 | 8.70% |
| 1990 | 9.20 | -8.00% |
| 1991 | 8.20 | -10.87% |
| 1992 | 9.00 | 9.76% |
| 1993 | 8.10 | -10.00% |
| 1994 | 8.50 | 4.94% |
| 1995 | 8.60 | 1.18% |
| 1996 | 9.90 | 15.12% |
| 1997 | 10.00 | 1.01% |
| 1998 | 10.00 | 0.00% |
| 1999 | 12.00 | 20.00% |
| 2000 | 11.00 | -8.33% |
| 2001 | 12.00 | 9.09% |
| 2002 | 13.00 | 8.33% |
| 2003 | 13.00 | 0.00% |
| 2004 | 15.00 | 15.38% |
| 2005 | 14.00 | -6.67% |
| 2006 | 13.00 | -7.14% |
| 2007 | 9.70 | -25.38% |
| 2008 | 8.70 | -10.31% |
| 2009 | 7.80 | -10.34% |
| 2010 | 7.60 | -2.56% |
| 2011 | 9.60 | 26.32% |
| 2012 | 5.60 | -41.67% |
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