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| year | consumption | change |
| 1986 | 7.00 | NA |
| 1987 | 7.60 | 8.57% |
| 1988 | 6.40 | -15.79% |
| 1989 | 6.60 | 3.13% |
| 1990 | 45.00 | 581.82% |
| 1991 | 47.00 | 4.44% |
| 1992 | 44.00 | -6.38% |
| 1993 | 46.00 | 4.55% |
| 1994 | 45.00 | -2.17% |
| 1995 | 52.00 | 15.56% |
| 1996 | 55.00 | 5.77% |
| 1997 | 61.00 | 10.91% |
| 1998 | 67.00 | 9.84% |
| 1999 | 63.00 | -5.97% |
| 2000 | 2.40 | -96.19% |
| 2001 | 4.90 | 104.17% |
| 2002 | 4.10 | -16.33% |
| 2003 | 3.70 | -9.76% |
| 2004 | 1.90 | -48.65% |
| 2005 | 1.10 | -42.11% |
| 2006 | .90 | -18.18% |
| 2007 | .40 | -55.56% |
| 2008 | .40 | 0.00% |
| 2009 | .40 | 0.00% |
| 2010 | .40 | 0.00% |
| 2011 | .50 | 25.00% |
| 2012 | .40 | -20.00% |
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