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| year | consumption | change |
| 1986 | 1.00 | NA |
| 1987 | 1.80 | 80.00% |
| 1988 | 2.00 | 11.11% |
| 1989 | 1.90 | -5.00% |
| 1990 | .90 | -52.63% |
| 1991 | .90 | 0.00% |
| 1992 | 1.20 | 33.33% |
| 1993 | 1.00 | -16.67% |
| 1994 | .90 | -10.00% |
| 1995 | 1.40 | 55.56% |
| 1996 | 1.80 | 28.57% |
| 1997 | 1.90 | 5.56% |
| 1998 | 2.20 | 15.79% |
| 1999 | 2.20 | 0.00% |
| 2000 | 2.40 | 9.09% |
| 2001 | 2.40 | 0.00% |
| 2002 | 2.40 | 0.00% |
| 2003 | 2.50 | 4.17% |
| 2004 | 2.60 | 4.00% |
| 2005 | 2.70 | 3.85% |
| 2006 | 2.80 | 3.70% |
| 2007 | 4.20 | 50.00% |
| 2008 | 5.30 | 26.19% |
| 2009 | 5.30 | 0.00% |
| 2010 | 2.90 | -45.28% |
| 2011 | 5.30 | 82.76% |
| 2012 | 3.00 | -43.40% |
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