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| year | consumption | change |
| 1986 | 1.00 | NA |
| 1987 | .90 | -10.00% |
| 1988 | 1.60 | 77.78% |
| 1989 | 1.30 | -18.75% |
| 1990 | .90 | -30.77% |
| 1991 | 1.60 | 77.78% |
| 1992 | 1.60 | 0.00% |
| 1993 | 2.00 | 25.00% |
| 1994 | 2.60 | 30.00% |
| 1995 | 2.20 | -15.38% |
| 1996 | 3.50 | 59.09% |
| 1997 | 3.50 | 0.00% |
| 1998 | 3.70 | 5.71% |
| 1999 | 4.10 | 10.81% |
| 2000 | 4.50 | 9.76% |
| 2001 | 4.70 | 4.44% |
| 2002 | 4.00 | -14.89% |
| 2003 | 5.60 | 40.00% |
| 2004 | 5.20 | -7.14% |
| 2005 | 5.40 | 3.85% |
| 2006 | 6.70 | 24.07% |
| 2007 | 6.90 | 2.99% |
| 2008 | 7.00 | 1.45% |
| 2009 | 7.40 | 5.71% |
| 2010 | 7.80 | 5.41% |
| 2011 | 6.70 | -14.10% |
| 2012 | 7.70 | 14.93% |
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