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| year | consumption | change |
| 1986 | 1.60 | NA |
| 1987 | 1.50 | -6.25% |
| 1988 | 1.70 | 13.33% |
| 1989 | 1.70 | 0.00% |
| 1990 | 1.70 | 0.00% |
| 1991 | 1.70 | 0.00% |
| 1992 | 2.20 | 29.41% |
| 1993 | 2.20 | 0.00% |
| 1994 | 2.30 | 4.55% |
| 1995 | 2.10 | -8.70% |
| 1996 | 2.20 | 4.76% |
| 1997 | 2.30 | 4.55% |
| 1998 | 1.90 | -17.39% |
| 1999 | 1.40 | -26.32% |
| 2000 | 1.30 | -7.14% |
| 2001 | 1.50 | 15.38% |
| 2002 | 1.50 | 0.00% |
| 2003 | 1.40 | -6.67% |
| 2004 | .80 | -42.86% |
| 2005 | .90 | 12.50% |
| 2006 | 1.30 | 44.44% |
| 2007 | 1.90 | 46.15% |
| 2008 | 1.70 | -10.53% |
| 2009 | 1.60 | -5.88% |
| 2010 | 1.50 | -6.25% |
| 2011 | 1.50 | 0.00% |
| 2012 | 1.50 | 0.00% |
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