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| year | consumption | change |
| 1986 | 1.50 | NA |
| 1987 | 2.00 | 33.33% |
| 1988 | 1.70 | -15.00% |
| 1989 | 2.00 | 17.65% |
| 1990 | 2.00 | 0.00% |
| 1991 | 2.10 | 5.00% |
| 1992 | 1.40 | -33.33% |
| 1993 | 1.60 | 14.29% |
| 1994 | 1.00 | -37.50% |
| 1995 | 1.40 | 40.00% |
| 1996 | 1.40 | 0.00% |
| 1997 | 1.50 | 7.14% |
| 1998 | 1.50 | 0.00% |
| 1999 | 1.50 | 0.00% |
| 2000 | 1.50 | 0.00% |
| 2001 | 1.60 | 6.67% |
| 2002 | 1.50 | -6.25% |
| 2003 | 1.50 | 0.00% |
| 2004 | 1.70 | 13.33% |
| 2005 | 1.80 | 5.88% |
| 2006 | 1.30 | -27.78% |
| 2007 | 1.40 | 7.69% |
| 2008 | 1.40 | 0.00% |
| 2009 | .40 | -71.43% |
| 2010 | .40 | 0.00% |
| 2011 | .40 | 0.00% |
| 2012 | .40 | 0.00% |
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