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| year | consumption | change |
| 1986 | .50 | NA |
| 1987 | .60 | 20.00% |
| 1988 | .80 | 33.33% |
| 1989 | .90 | 12.50% |
| 1990 | 1.10 | 22.22% |
| 1991 | 1.20 | 9.09% |
| 1992 | 1.30 | 8.33% |
| 1993 | 1.30 | 0.00% |
| 1994 | 1.00 | -23.08% |
| 1995 | .70 | -30.00% |
| 1996 | .70 | 0.00% |
| 1997 | 2.40 | 242.86% |
| 1998 | 2.80 | 16.67% |
| 1999 | 3.20 | 14.29% |
| 2000 | 3.20 | 0.00% |
| 2001 | 3.40 | 6.25% |
| 2002 | 3.60 | 5.88% |
| 2003 | 3.80 | 5.56% |
| 2004 | 4.10 | 7.89% |
| 2005 | 4.20 | 2.44% |
| 2006 | 4.20 | 0.00% |
| 2007 | 4.20 | 0.00% |
| 2008 | 3.90 | -7.14% |
| 2009 | 4.10 | 5.13% |
| 2010 | 3.70 | -9.76% |
| 2011 | 3.10 | -16.22% |
| 2012 | 3.30 | 6.45% |
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