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| year | consumption | change |
| 1990 | .00 | NA |
| 1991 | .10 | NA |
| 1992 | .20 | 100.00% |
| 1993 | .20 | 0.00% |
| 1994 | .30 | 50.00% |
| 1995 | .30 | 0.00% |
| 1996 | .30 | 0.00% |
| 1997 | .70 | 133.33% |
| 1998 | 1.20 | 71.43% |
| 1999 | 1.20 | 0.00% |
| 2000 | 1.30 | 8.33% |
| 2001 | 1.60 | 23.08% |
| 2002 | 1.80 | 12.50% |
| 2003 | 2.00 | 11.11% |
| 2004 | 2.10 | 5.00% |
| 2005 | 2.20 | 4.76% |
| 2006 | 2.90 | 31.82% |
| 2007 | 3.00 | 3.45% |
| 2008 | 3.00 | 0.00% |
| 2009 | 4.50 | 50.00% |
| 2010 | 5.10 | 13.33% |
| 2011 | 4.50 | -11.76% |
| 2012 | 4.50 | 0.00% |
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