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| year | consumption | change |
| 1986 | .50 | NA |
| 1987 | 5.30 | 960.00% |
| 1988 | 5.70 | 7.55% |
| 1989 | 5.10 | -10.53% |
| 1990 | 5.10 | 0.00% |
| 1991 | 5.80 | 13.73% |
| 1992 | 5.10 | -12.07% |
| 1993 | 5.70 | 11.76% |
| 1994 | 5.50 | -3.51% |
| 1995 | 5.20 | -5.45% |
| 1996 | 5.80 | 11.54% |
| 1997 | 6.60 | 13.79% |
| 1998 | 7.00 | 6.06% |
| 1999 | 6.50 | -7.14% |
| 2000 | 6.30 | -3.08% |
| 2001 | 6.20 | -1.59% |
| 2002 | 6.80 | 9.68% |
| 2003 | 6.30 | -7.35% |
| 2004 | 6.80 | 7.94% |
| 2005 | 6.40 | -5.88% |
| 2006 | 6.80 | 6.25% |
| 2007 | 5.90 | -13.24% |
| 2008 | 6.60 | 11.86% |
| 2009 | 6.00 | -9.09% |
| 2010 | 6.20 | 3.33% |
| 2011 | 5.70 | -8.06% |
| 2012 | 5.50 | -3.51% |
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