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| year | consumption | change |
| 1986 | .10 | NA |
| 1987 | .20 | 100.00% |
| 1988 | .20 | 0.00% |
| 1989 | .20 | 0.00% |
| 1991 | .20 | 0.00% |
| 1996 | 1.60 | 700.00% |
| 1997 | 4.00 | 150.00% |
| 1998 | 6.20 | 55.00% |
| 1999 | 6.90 | 11.29% |
| 2000 | 11.00 | 59.42% |
| 2001 | 11.00 | 0.00% |
| 2002 | 3.10 | -71.82% |
| 2003 | 15.00 | 383.87% |
| 2004 | 9.30 | -38.00% |
| 2005 | 12.00 | 29.03% |
| 2006 | 24.00 | 100.00% |
| 2007 | 29.00 | 20.83% |
| 2008 | 28.00 | -3.45% |
| 2009 | 28.00 | 0.00% |
| 2010 | 43.00 | 53.57% |
| 2011 | 44.00 | 2.33% |
| 2012 | 46.00 | 4.55% |
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