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| year | consumption | change |
| 1986 | 1.20 | NA |
| 1987 | 1.10 | -8.33% |
| 1988 | 1.20 | 9.09% |
| 1989 | 1.10 | -8.33% |
| 1990 | 1.10 | 0.00% |
| 1991 | 1.00 | -9.09% |
| 1992 | 1.00 | 0.00% |
| 1993 | .90 | -10.00% |
| 1994 | 1.00 | 11.11% |
| 1995 | .90 | -10.00% |
| 1996 | 1.60 | 77.78% |
| 1997 | .50 | -68.75% |
| 1998 | .50 | 0.00% |
| 1999 | .50 | 0.00% |
| 2000 | .50 | 0.00% |
| 2001 | .40 | -20.00% |
| 2002 | .30 | -25.00% |
| 2003 | .20 | -33.33% |
| 2004 | .20 | 0.00% |
| 2005 | .20 | 0.00% |
| 2006 | .10 | -50.00% |
| 2007 | .20 | 100.00% |
| 2008 | .20 | 0.00% |
| 2009 | .20 | 0.00% |
| 2010 | .20 | 0.00% |
| 2011 | .20 | 0.00% |
| 2012 | .20 | 0.00% |
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