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| year | consumption | change |
| 1986 | 1.00 | NA |
| 1987 | .90 | -10.00% |
| 1988 | 1.00 | 11.11% |
| 1989 | 1.00 | 0.00% |
| 1990 | 1.00 | 0.00% |
| 1991 | .90 | -10.00% |
| 1992 | 1.10 | 22.22% |
| 1993 | 1.10 | 0.00% |
| 1994 | 1.00 | -9.09% |
| 1995 | 1.00 | 0.00% |
| 1996 | 1.00 | 0.00% |
| 1997 | 1.10 | 10.00% |
| 1998 | 1.10 | 0.00% |
| 1999 | 1.10 | 0.00% |
| 2000 | 3.10 | 181.82% |
| 2001 | 3.10 | 0.00% |
| 2002 | 3.00 | -3.23% |
| 2003 | 3.20 | 6.67% |
| 2004 | 2.80 | -12.50% |
| 2005 | 1.70 | -39.29% |
| 2006 | 3.40 | 100.00% |
| 2007 | 5.10 | 50.00% |
| 2008 | 5.40 | 5.88% |
| 2009 | 8.00 | 48.15% |
| 2010 | 9.30 | 16.25% |
| 2011 | 8.00 | -13.98% |
| 2012 | 8.00 | 0.00% |
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