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| year | consumption | change |
| 1986 | 6.80 | NA |
| 1987 | 4.00 | -41.18% |
| 1988 | 2.00 | -50.00% |
| 1989 | 1.80 | -10.00% |
| 1990 | 2.00 | 11.11% |
| 1991 | 1.80 | -10.00% |
| 1992 | 1.80 | 0.00% |
| 1993 | 2.10 | 16.67% |
| 1994 | 3.00 | 42.86% |
| 1995 | 4.20 | 40.00% |
| 1996 | 4.20 | 0.00% |
| 1997 | 2.00 | -52.38% |
| 1998 | 1.90 | -5.00% |
| 1999 | 1.80 | -5.26% |
| 2000 | 2.30 | 27.78% |
| 2001 | 1.90 | -17.39% |
| 2002 | 2.90 | 52.63% |
| 2003 | 2.50 | -13.79% |
| 2004 | 2.50 | 0.00% |
| 2005 | 2.20 | -12.00% |
| 2006 | 2.50 | 13.64% |
| 2007 | 2.20 | -12.00% |
| 2008 | .90 | -59.09% |
| 2009 | 2.80 | 211.11% |
| 2010 | 2.70 | -3.57% |
| 2011 | 2.70 | 0.00% |
| 2012 | 2.90 | 7.41% |
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