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| year | consumption | change |
| 1987 | .70 | NA |
| 1988 | .80 | 14.29% |
| 1989 | .80 | 0.00% |
| 1990 | 1.00 | 25.00% |
| 1991 | 1.00 | 0.00% |
| 1992 | .60 | -40.00% |
| 1993 | .50 | -16.67% |
| 1994 | .70 | 40.00% |
| 1995 | .70 | 0.00% |
| 1996 | .50 | -28.57% |
| 1997 | .80 | 60.00% |
| 1998 | .80 | 0.00% |
| 1999 | .60 | -25.00% |
| 2000 | 1.00 | 66.67% |
| 2001 | .90 | -10.00% |
| 2002 | 1.10 | 22.22% |
| 2003 | 1.30 | 18.18% |
| 2004 | 1.30 | 0.00% |
| 2005 | 1.20 | -7.69% |
| 2006 | 1.40 | 16.67% |
| 2007 | 1.50 | 7.14% |
| 2008 | 1.70 | 13.33% |
| 2009 | 1.70 | 0.00% |
| 2010 | 1.80 | 5.88% |
| 2011 | 1.80 | 0.00% |
| 2012 | 1.90 | 5.56% |
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