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| year | consumption | change |
| 1986 | .50 | NA |
| 1987 | .60 | 20.00% |
| 1988 | .60 | 0.00% |
| 1989 | .80 | 33.33% |
| 1990 | .90 | 12.50% |
| 1991 | .80 | -11.11% |
| 1992 | 1.00 | 25.00% |
| 1993 | .90 | -10.00% |
| 1994 | 2.00 | 122.22% |
| 1995 | .80 | -60.00% |
| 1996 | 1.40 | 75.00% |
| 1997 | 1.60 | 14.29% |
| 1998 | 1.90 | 18.75% |
| 1999 | 2.30 | 21.05% |
| 2000 | 2.90 | 26.09% |
| 2001 | 2.40 | -17.24% |
| 2002 | 3.30 | 37.50% |
| 2003 | 3.40 | 3.03% |
| 2004 | 3.30 | -2.94% |
| 2005 | 2.90 | -12.12% |
| 2006 | 3.20 | 10.34% |
| 2007 | 3.50 | 9.38% |
| 2008 | 3.40 | -2.86% |
| 2009 | 3.40 | 0.00% |
| 2010 | 3.60 | 5.88% |
| 2011 | 3.70 | 2.78% |
| 2012 | 3.80 | 2.70% |
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