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Loading...
| year | consumption | change |
| 1986 | 5.80 | NA |
| 1987 | 4.30 | -25.86% |
| 1988 | 5.10 | 18.60% |
| 1989 | 3.00 | -41.18% |
| 1990 | 3.80 | 26.67% |
| 1991 | 2.20 | -42.11% |
| 1992 | 2.40 | 9.09% |
| 1993 | 3.30 | 37.50% |
| 1994 | 1.30 | -60.61% |
| 1995 | 1.80 | 38.46% |
| 1996 | 2.00 | 11.11% |
| 1997 | 1.40 | -30.00% |
| 1998 | 1.30 | -7.14% |
| 1999 | 1.80 | 38.46% |
| 2001 | .20 | -88.89% |
| 2003 | .00 | -100.00% |
| 2004 | .00 | NA |
| 2005 | .00 | NA |
| 2006 | .00 | NA |
| 2007 | .00 | NA |
| 2008 | .00 | NA |
| 2009 | .00 | NA |
| 2011 | .10 | NA |
| 2012 | .10 | 0.00% |
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