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| year | consumption | change |
| 1986 | 4.50 | NA |
| 1987 | 3.80 | -15.56% |
| 1988 | 3.30 | -13.16% |
| 1989 | 3.60 | 9.09% |
| 1990 | 3.30 | -8.33% |
| 1991 | 3.00 | -9.09% |
| 1992 | 3.60 | 20.00% |
| 1993 | 3.30 | -8.33% |
| 1994 | 2.50 | -24.24% |
| 1995 | 2.40 | -4.00% |
| 1996 | 2.40 | 0.00% |
| 1997 | 2.50 | 4.17% |
| 1998 | 2.00 | -20.00% |
| 1999 | 1.50 | -25.00% |
| 2000 | 1.90 | 26.67% |
| 2001 | 1.50 | -21.05% |
| 2002 | 2.00 | 33.33% |
| 2003 | 1.60 | -20.00% |
| 2004 | .90 | -43.75% |
| 2005 | .30 | -66.67% |
| 2006 | .30 | 0.00% |
| 2007 | .50 | 66.67% |
| 2008 | .40 | -20.00% |
| 2009 | .60 | 50.00% |
| 2010 | .30 | -50.00% |
| 2011 | .60 | 100.00% |
| 2012 | .40 | -33.33% |
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