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| year | consumption | change |
| 1986 | 3.00 | NA |
| 1987 | 3.20 | 6.67% |
| 1988 | 2.80 | -12.50% |
| 1989 | 4.60 | 64.29% |
| 1990 | 4.00 | -13.04% |
| 1991 | 4.10 | 2.50% |
| 1992 | 5.90 | 43.90% |
| 1993 | 5.10 | -13.56% |
| 1994 | 2.00 | -60.78% |
| 1995 | 3.30 | 65.00% |
| 1996 | 3.80 | 15.15% |
| 1997 | 12.00 | 215.79% |
| 1998 | 14.00 | 16.67% |
| 1999 | .70 | -95.00% |
| 2000 | 14.00 | 1,900.00% |
| 2001 | 15.00 | 7.14% |
| 2002 | 18.00 | 20.00% |
| 2003 | 20.00 | 11.11% |
| 2004 | 21.00 | 5.00% |
| 2005 | 21.00 | 0.00% |
| 2006 | 23.00 | 9.52% |
| 2007 | .00 | -100.00% |
| 2008 | 22.00 | NA |
| 2009 | 1.60 | -92.73% |
| 2010 | 23.00 | 1,337.50% |
| 2011 | 18.00 | -21.74% |
| 2012 | 21.00 | 16.67% |
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