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| year | consumption | change |
| 1986 | 5.10 | NA |
| 1987 | 5.30 | 3.92% |
| 1988 | 5.10 | -3.77% |
| 1989 | 5.10 | 0.00% |
| 1990 | 5.40 | 5.88% |
| 1991 | 5.50 | 1.85% |
| 1992 | 5.50 | 0.00% |
| 1993 | 5.50 | 0.00% |
| 1994 | 4.20 | -23.64% |
| 1995 | 3.90 | -7.14% |
| 1996 | 2.50 | -35.90% |
| 1997 | 2.50 | 0.00% |
| 1998 | 4.60 | 84.00% |
| 1999 | 4.40 | -4.35% |
| 2000 | 4.80 | 9.09% |
| 2001 | .80 | -83.33% |
| 2002 | .80 | 0.00% |
| 2003 | .80 | 0.00% |
| 2004 | .80 | 0.00% |
| 2005 | .70 | -12.50% |
| 2006 | .50 | -28.57% |
| 2007 | .60 | 20.00% |
| 2008 | .70 | 16.67% |
| 2009 | .50 | -28.57% |
| 2010 | .80 | 60.00% |
| 2011 | .80 | 0.00% |
| 2012 | .80 | 0.00% |
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