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| year | consumption | change |
| 1986 | .80 | NA |
| 1987 | .80 | 0.00% |
| 1988 | .80 | 0.00% |
| 1989 | 1.10 | 37.50% |
| 1990 | .50 | -54.55% |
| 1991 | .90 | 80.00% |
| 1992 | .90 | 0.00% |
| 1993 | .90 | 0.00% |
| 1994 | .90 | 0.00% |
| 1995 | .90 | 0.00% |
| 1996 | .90 | 0.00% |
| 1997 | 1.00 | 11.11% |
| 1998 | 1.20 | 20.00% |
| 1999 | 1.20 | 0.00% |
| 2000 | 1.20 | 0.00% |
| 2001 | 1.20 | 0.00% |
| 2002 | 2.30 | 91.67% |
| 2003 | 1.60 | -30.43% |
| 2004 | 2.20 | 37.50% |
| 2005 | 2.00 | -9.09% |
| 2006 | 1.70 | -15.00% |
| 2007 | 2.50 | 47.06% |
| 2008 | 2.30 | -8.00% |
| 2009 | 2.20 | -4.35% |
| 2010 | 3.60 | 63.64% |
| 2011 | 3.90 | 8.33% |
| 2012 | 4.10 | 5.13% |
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