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| year | consumption | change |
| 1986 | .30 | NA |
| 1987 | .20 | -33.33% |
| 1988 | .10 | -50.00% |
| 1989 | .10 | 0.00% |
| 1998 | .90 | 800.00% |
| 2000 | 1.00 | 11.11% |
| 2001 | .90 | -10.00% |
| 2002 | 1.20 | 33.33% |
| 2003 | 1.30 | 8.33% |
| 2004 | 1.50 | 15.38% |
| 2005 | 1.60 | 6.67% |
| 2006 | 2.20 | 37.50% |
| 2007 | 2.60 | 18.18% |
| 2008 | 2.40 | -7.69% |
| 2009 | 1.40 | -41.67% |
| 2010 | 3.10 | 121.43% |
| 2011 | 3.20 | 3.23% |
| 2012 | 2.80 | -12.50% |
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