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| year | consumption | change |
| 1986 | 7.90 | NA |
| 1987 | 8.40 | 6.33% |
| 1988 | 8.40 | 0.00% |
| 1989 | 7.10 | -15.48% |
| 1990 | 6.90 | -2.82% |
| 1991 | 7.10 | 2.90% |
| 1992 | 5.80 | -18.31% |
| 1993 | 7.00 | 20.69% |
| 1994 | 2.80 | -60.00% |
| 1995 | 4.80 | 71.43% |
| 1996 | 2.30 | -52.08% |
| 1997 | 2.10 | -8.70% |
| 1998 | 1.80 | -14.29% |
| 1999 | 1.30 | -27.78% |
| 2000 | 1.10 | -15.38% |
| 2001 | 1.00 | -9.09% |
| 2002 | 1.00 | 0.00% |
| 2003 | .30 | -70.00% |
| 2004 | .50 | 66.67% |
| 2005 | .50 | 0.00% |
| 2006 | .40 | -20.00% |
| 2007 | .40 | 0.00% |
| 2008 | .40 | 0.00% |
| 2009 | .60 | 50.00% |
| 2010 | .70 | 16.67% |
| 2011 | .50 | -28.57% |
| 2012 | 1.40 | 180.00% |
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