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| year | consumption | change |
| 1986 | 1.50 | NA |
| 1987 | 1.20 | -20.00% |
| 1988 | 1.60 | 33.33% |
| 1989 | 1.80 | 12.50% |
| 1990 | 1.60 | -11.11% |
| 1991 | 1.70 | 6.25% |
| 1992 | 1.80 | 5.88% |
| 1993 | 1.40 | -22.22% |
| 1994 | 1.40 | 0.00% |
| 1995 | 1.90 | 35.71% |
| 1996 | 1.10 | -42.11% |
| 1997 | 1.80 | 63.64% |
| 1998 | 1.90 | 5.56% |
| 1999 | 3.40 | 78.95% |
| 2000 | 2.00 | -41.18% |
| 2001 | 2.90 | 45.00% |
| 2002 | 2.10 | -27.59% |
| 2003 | 1.80 | -14.29% |
| 2004 | 1.90 | 5.56% |
| 2005 | 2.10 | 10.53% |
| 2006 | 5.30 | 152.38% |
| 2007 | 6.30 | 18.87% |
| 2008 | 1.90 | -69.84% |
| 2009 | 2.00 | 5.26% |
| 2010 | 1.80 | -10.00% |
| 2011 | 1.10 | -38.89% |
| 2012 | .60 | -45.45% |
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