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| year | consumption | change |
| 1986 | 2.30 | NA |
| 1987 | 2.40 | 4.35% |
| 1988 | 2.30 | -4.17% |
| 1989 | 2.40 | 4.35% |
| 1990 | 2.50 | 4.17% |
| 1991 | 3.00 | 20.00% |
| 1992 | 3.50 | 16.67% |
| 1993 | 3.00 | -14.29% |
| 1994 | 2.50 | -16.67% |
| 1995 | 2.20 | -12.00% |
| 1996 | 2.00 | -9.09% |
| 1997 | 2.10 | 5.00% |
| 1998 | 2.40 | 14.29% |
| 1999 | 2.50 | 4.17% |
| 2000 | 2.70 | 8.00% |
| 2001 | 2.20 | -18.52% |
| 2002 | 2.80 | 27.27% |
| 2003 | 1.70 | -39.29% |
| 2004 | 1.80 | 5.88% |
| 2005 | 2.90 | 61.11% |
| 2006 | 1.90 | -34.48% |
| 2007 | 1.80 | -5.26% |
| 2008 | 1.80 | 0.00% |
| 2009 | 2.10 | 16.67% |
| 2010 | 1.20 | -42.86% |
| 2011 | .90 | -25.00% |
| 2012 | 1.40 | 55.56% |
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