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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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