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| year | consumption | change |
| 1986 | 3.40 | NA |
| 1987 | 3.90 | 14.71% |
| 1988 | 3.90 | 0.00% |
| 1989 | 4.20 | 7.69% |
| 1990 | 4.60 | 9.52% |
| 1991 | 3.80 | -17.39% |
| 1992 | 4.60 | 21.05% |
| 1993 | 4.40 | -4.35% |
| 1994 | 2.00 | -54.55% |
| 1995 | 5.30 | 165.00% |
| 1996 | 1.70 | -67.92% |
| 1997 | .70 | -58.82% |
| 1998 | .60 | -14.29% |
| 1999 | .60 | 0.00% |
| 2000 | .60 | 0.00% |
| 2001 | 2.90 | 383.33% |
| 2002 | 3.30 | 13.79% |
| 2003 | .90 | -72.73% |
| 2004 | .70 | -22.22% |
| 2005 | 1.30 | 85.71% |
| 2006 | .80 | -38.46% |
| 2008 | 1.30 | 62.50% |
| 2009 | .80 | -38.46% |
| 2010 | 2.80 | 250.00% |
| 2011 | 4.30 | 53.57% |
| 2012 | 3.40 | -20.93% |
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