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| year | consumption | change |
| 1986 | 15.00 | NA |
| 1987 | 18.00 | 20.00% |
| 1988 | 17.00 | -5.56% |
| 1989 | 17.00 | 0.00% |
| 1990 | 12.00 | -29.41% |
| 1991 | 16.00 | 33.33% |
| 1992 | 12.00 | -25.00% |
| 1993 | 12.00 | 0.00% |
| 1994 | 13.00 | 8.33% |
| 1995 | 6.30 | -51.54% |
| 1996 | 8.50 | 34.92% |
| 1997 | 9.20 | 8.24% |
| 1998 | 7.10 | -22.83% |
| 1999 | 2.80 | -60.56% |
| 2000 | .10 | -96.43% |
| 2001 | 3.00 | 2,900.00% |
| 2002 | 1.90 | -36.67% |
| 2003 | 2.40 | 26.32% |
| 2004 | 1.80 | -25.00% |
| 2005 | 2.80 | 55.56% |
| 2006 | 2.40 | -14.29% |
| 2007 | 1.50 | -37.50% |
| 2008 | 5.00 | 233.33% |
| 2009 | 6.00 | 20.00% |
| 2010 | 5.90 | -1.67% |
| 2011 | 12.00 | 103.39% |
| 2012 | 5.40 | -55.00% |
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