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| year | consumption | change |
| 1986 | 9.00 | NA |
| 1987 | 6.70 | -25.56 % |
| 1988 | 6.60 | -1.49 % |
| 1989 | 6.50 | -1.52 % |
| 1990 | 4.50 | -30.77 % |
| 1991 | 2.50 | -44.44 % |
| 1992 | 6.60 | 164.00 % |
| 1993 | 2.50 | -62.12 % |
| 1994 | 2.10 | -16.00 % |
| 1995 | 2.30 | 9.52 % |
| 1996 | 2.00 | -13.04 % |
| 1997 | 4.20 | 110.00 % |
| 1998 | 7.20 | 71.43 % |
| 1999 | 2.10 | -70.83 % |
| 2000 | 8.40 | 300.00 % |
| 2001 | 11.00 | 30.95 % |
| 2002 | 9.90 | -10.00 % |
| 2003 | 12.00 | 21.21 % |
| 2004 | 12.00 | 0.00 % |
| 2005 | 14.00 | 16.67 % |
| 2006 | 12.00 | -14.29 % |
| 2007 | 13.00 | 8.33 % |
| 2008 | 16.00 | 23.08 % |
| 2009 | 9.20 | -42.50 % |
| 2010 | 13.00 | 41.30 % |
| 2011 | 15.00 | 15.38 % |
| 2012 | 14.00 | -6.67 % |
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