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| year | consumption | change |
| 1986 | 2.20 | NA |
| 1987 | 4.80 | 118.18% |
| 1988 | 4.90 | 2.08% |
| 1989 | 6.50 | 32.65% |
| 1990 | 4.80 | -26.15% |
| 1991 | 4.80 | 0.00% |
| 1992 | 5.00 | 4.17% |
| 1993 | 5.50 | 10.00% |
| 1994 | 5.20 | -5.45% |
| 1995 | 9.00 | 73.08% |
| 1996 | 10.00 | 11.11% |
| 1997 | 12.00 | 20.00% |
| 1998 | 13.00 | 8.33% |
| 1999 | .40 | -96.92% |
| 2000 | 16.00 | 3,900.00% |
| 2001 | 17.00 | 6.25% |
| 2002 | 17.00 | 0.00% |
| 2003 | 18.00 | 5.88% |
| 2004 | 1.70 | -90.56% |
| 2005 | 1.80 | 5.88% |
| 2006 | 18.00 | 900.00% |
| 2007 | 18.00 | 0.00% |
| 2008 | 18.00 | 0.00% |
| 2009 | 1.80 | -90.00% |
| 2010 | 23.00 | 1,177.78% |
| 2011 | 13.00 | -43.48% |
| 2012 | 9.50 | -26.92% |
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