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| year | consumption | change |
| 1986 | 2.60 | NA |
| 1987 | 2.80 | 7.69% |
| 1988 | 2.00 | -28.57% |
| 1989 | .70 | -65.00% |
| 1990 | 3.00 | 328.57% |
| 1991 | 3.60 | 20.00% |
| 1992 | 6.30 | 75.00% |
| 1993 | 5.60 | -11.11% |
| 1994 | 2.60 | -53.57% |
| 1995 | 3.80 | 46.15% |
| 1996 | 4.00 | 5.26% |
| 1997 | 5.30 | 32.50% |
| 1998 | 5.10 | -3.77% |
| 1999 | 5.00 | -1.96% |
| 2000 | 5.80 | 16.00% |
| 2001 | 5.90 | 1.72% |
| 2002 | 6.70 | 13.56% |
| 2003 | 5.70 | -14.93% |
| 2004 | 7.60 | 33.33% |
| 2005 | 8.00 | 5.26% |
| 2006 | 5.50 | -31.25% |
| 2007 | 7.50 | 36.36% |
| 2008 | 12.00 | 60.00% |
| 2009 | 10.00 | -16.67% |
| 2010 | 13.00 | 30.00% |
| 2011 | 12.00 | -7.69% |
| 2012 | 13.00 | 8.33% |
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