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| year | consumption | change |
| 1986 | .20 | NA |
| 1987 | .20 | 0.00% |
| 1988 | .20 | 0.00% |
| 1989 | .20 | 0.00% |
| 1990 | .20 | 0.00% |
| 1991 | .20 | 0.00% |
| 1992 | .30 | 50.00% |
| 1993 | .60 | 100.00% |
| 1994 | .60 | 0.00% |
| 1995 | .60 | 0.00% |
| 1996 | .50 | -16.67% |
| 1997 | .50 | 0.00% |
| 1998 | 2.20 | 340.00% |
| 1999 | 2.30 | 4.55% |
| 2000 | 1.30 | -43.48% |
| 2001 | 1.40 | 7.69% |
| 2002 | 1.70 | 21.43% |
| 2003 | 1.40 | -17.65% |
| 2004 | 2.20 | 57.14% |
| 2005 | 2.40 | 9.09% |
| 2006 | 3.00 | 25.00% |
| 2007 | 3.30 | 10.00% |
| 2008 | 3.90 | 18.18% |
| 2009 | 5.30 | 35.90% |
| 2010 | 5.80 | 9.43% |
| 2011 | 7.10 | 22.41% |
| 2012 | 8.60 | 21.13% |
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