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| year | consumption | change |
| 1987 | 1.00 | NA |
| 1988 | .60 | -40.00% |
| 1989 | .80 | 33.33% |
| 1990 | 1.00 | 25.00% |
| 1991 | 1.20 | 20.00% |
| 1992 | 3.10 | 158.33% |
| 1993 | 3.30 | 6.45% |
| 1994 | 4.00 | 21.21% |
| 1995 | 3.80 | -5.00% |
| 1996 | 3.30 | -13.16% |
| 1997 | 3.60 | 9.09% |
| 1998 | 3.40 | -5.56% |
| 1999 | 3.50 | 2.94% |
| 2000 | 3.50 | 0.00% |
| 2001 | 2.00 | -42.86% |
| 2002 | .00 | -100.00% |
| 2003 | .00 | NA |
| 2004 | .20 | NA |
| 2005 | 1.10 | 450.00% |
| 2006 | 4.10 | 272.73% |
| 2007 | 2.60 | -36.59% |
| 2009 | 1.20 | -53.85% |
| 2010 | 1.40 | 16.67% |
| 2011 | 1.40 | 0.00% |
| 2012 | 1.50 | 7.14% |
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