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| year | consumption | change |
| 1990 | 2.10 | NA |
| 1991 | 1.80 | -14.29% |
| 1992 | 1.50 | -16.67% |
| 1993 | 1.10 | -26.67% |
| 1994 | 1.10 | 0.00% |
| 1995 | 1.00 | -9.09% |
| 1996 | 1.00 | 0.00% |
| 1997 | 1.10 | 10.00% |
| 1998 | 1.20 | 9.09% |
| 1999 | .90 | -25.00% |
| 2000 | 1.10 | 22.22% |
| 2001 | 1.00 | -9.09% |
| 2002 | 1.00 | 0.00% |
| 2003 | 1.10 | 10.00% |
| 2004 | 1.00 | -9.09% |
| 2005 | 1.00 | 0.00% |
| 2006 | .70 | -30.00% |
| 2007 | .40 | -42.86% |
| 2008 | .30 | -25.00% |
| 2009 | .30 | 0.00% |
| 2010 | .30 | 0.00% |
| 2011 | .30 | 0.00% |
| 2012 | .30 | 0.00% |
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