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| year | consumption | change |
| 1986 | 14.00 | NA |
| 1987 | 13.00 | -7.14 % |
| 1988 | 12.00 | -7.69 % |
| 1989 | 11.00 | -8.33 % |
| 1990 | 8.80 | -20.00 % |
| 1991 | 5.50 | -37.50 % |
| 1992 | 5.50 | 0.00 % |
| 1993 | 4.20 | -23.64 % |
| 1994 | 2.80 | -33.33 % |
| 1995 | 3.00 | 7.14 % |
| 1996 | 4.00 | 33.33 % |
| 1997 | .80 | -80.00 % |
| 1998 | 1.30 | 62.50 % |
| 1999 | 1.40 | 7.69 % |
| 2000 | 4.40 | 214.29 % |
| 2001 | 1.00 | -77.27 % |
| 2002 | 1.40 | 40.00 % |
| 2003 | .90 | -35.71 % |
| 2004 | 1.40 | 55.56 % |
| 2005 | 1.30 | -7.14 % |
| 2006 | 1.00 | -23.08 % |
| 2007 | .60 | -40.00 % |
| 2008 | .50 | -16.67 % |
| 2009 | .50 | 0.00 % |
| 2010 | .20 | -60.00 % |
| 2011 | .30 | 50.00 % |
| 2012 | .20 | -33.33 % |
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