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| year | consumption | change |
| 1986 | 8.80 | NA |
| 1987 | 11.00 | 25.00% |
| 1988 | 9.60 | -12.73% |
| 1989 | 9.50 | -1.04% |
| 1990 | 11.00 | 15.79% |
| 1991 | 8.70 | -20.91% |
| 1992 | 10.00 | 14.94% |
| 1993 | 7.80 | -22.00% |
| 1994 | 7.20 | -7.69% |
| 1995 | 6.80 | -5.56% |
| 1996 | 5.70 | -16.18% |
| 1997 | 5.80 | 1.75% |
| 1998 | 5.20 | -10.34% |
| 1999 | 5.30 | 1.92% |
| 2000 | 2.20 | -58.49% |
| 2001 | 1.50 | -31.82% |
| 2002 | 1.20 | -20.00% |
| 2003 | .60 | -50.00% |
| 2004 | .60 | 0.00% |
| 2005 | .70 | 16.67% |
| 2006 | .50 | -28.57% |
| 2007 | .40 | -20.00% |
| 2008 | .20 | -50.00% |
| 2009 | .20 | 0.00% |
| 2010 | 7.40 | 3,600.00% |
| 2011 | 7.30 | -1.35% |
| 2012 | .30 | -95.89% |
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