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| year | consumption | change |
| 1986 | 5.30 | NA |
| 1987 | 6.20 | 16.98% |
| 1988 | 5.60 | -9.68% |
| 1989 | 4.80 | -14.29% |
| 1990 | 3.90 | -18.75% |
| 1991 | 3.70 | -5.13% |
| 1992 | 3.00 | -18.92% |
| 1993 | 3.30 | 10.00% |
| 1994 | 2.40 | -27.27% |
| 1995 | 2.20 | -8.33% |
| 1996 | 2.00 | -9.09% |
| 1997 | 1.60 | -20.00% |
| 1998 | 1.70 | 6.25% |
| 1999 | 1.10 | -35.29% |
| 2000 | .80 | -27.27% |
| 2001 | .60 | -25.00% |
| 2002 | .60 | 0.00% |
| 2003 | 1.50 | 150.00% |
| 2004 | .80 | -46.67% |
| 2005 | .60 | -25.00% |
| 2006 | .50 | -16.67% |
| 2007 | .90 | 80.00% |
| 2008 | 1.10 | 22.22% |
| 2009 | .80 | -27.27% |
| 2010 | 1.20 | 50.00% |
| 2011 | 1.40 | 16.67% |
| 2012 | 1.00 | -28.57% |
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