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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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