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| year | consumption | change |
| 1986 | 2.40 | NA |
| 1987 | 2.50 | 4.17% |
| 1988 | 2.60 | 4.00% |
| 1989 | 3.10 | 19.23% |
| 1990 | 4.40 | 41.94% |
| 1991 | 2.50 | -43.18% |
| 1992 | 5.70 | 128.00% |
| 1993 | 3.70 | -35.09% |
| 1994 | 4.60 | 24.32% |
| 1995 | 3.70 | -19.57% |
| 1996 | .00 | -100.00% |
| 1997 | .00 | NA |
| 1998 | 2.00 | NA |
| 1999 | 1.90 | -5.00% |
| 2000 | 2.10 | 10.53% |
| 2001 | 2.20 | 4.76% |
| 2002 | 2.60 | 18.18% |
| 2003 | 2.40 | -7.69% |
| 2004 | 2.80 | 16.67% |
| 2005 | 3.60 | 28.57% |
| 2006 | 2.90 | -19.44% |
| 2007 | 2.40 | -17.24% |
| 2008 | 2.70 | 12.50% |
| 2009 | 3.00 | 11.11% |
| 2010 | 2.40 | -20.00% |
| 2011 | 2.70 | 12.50% |
| 2012 | 2.90 | 7.41% |
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