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| year | consumption | change |
| 1986 | 3.40 | NA |
| 1987 | 3.40 | 0.00% |
| 1988 | 3.40 | 0.00% |
| 1989 | 4.30 | 26.47% |
| 1990 | 4.70 | 9.30% |
| 1991 | 4.00 | -14.89% |
| 1992 | 4.50 | 12.50% |
| 1993 | 5.40 | 20.00% |
| 1994 | 6.00 | 11.11% |
| 1995 | 6.80 | 13.33% |
| 1996 | 6.90 | 1.47% |
| 1997 | 6.30 | -8.70% |
| 1998 | 5.60 | -11.11% |
| 1999 | 6.00 | 7.14% |
| 2000 | 5.80 | -3.33% |
| 2001 | 11.00 | 89.66% |
| 2002 | 8.40 | -23.64% |
| 2003 | 7.30 | -13.10% |
| 2004 | 7.60 | 4.11% |
| 2005 | 7.10 | -6.58% |
| 2006 | 6.50 | -8.45% |
| 2007 | 4.70 | -27.69% |
| 2008 | 2.20 | -53.19% |
| 2009 | .50 | -77.27% |
| 2010 | 1.90 | 280.00% |
| 2011 | 2.00 | 5.26% |
| 2012 | 2.10 | 5.00% |
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