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| year | consumption | change |
| 1986 | .70 | NA |
| 1987 | .70 | 0.00% |
| 1988 | .80 | 14.29% |
| 1989 | .80 | 0.00% |
| 1990 | .80 | 0.00% |
| 1991 | .80 | 0.00% |
| 1992 | .80 | 0.00% |
| 1993 | .80 | 0.00% |
| 1994 | .80 | 0.00% |
| 1995 | .90 | 12.50% |
| 1996 | 1.00 | 11.11% |
| 1997 | 1.10 | 10.00% |
| 1998 | 1.00 | -9.09% |
| 1999 | 1.60 | 60.00% |
| 2000 | 1.00 | -37.50% |
| 2001 | 1.20 | 20.00% |
| 2002 | 1.60 | 33.33% |
| 2003 | 2.00 | 25.00% |
| 2004 | 2.60 | 30.00% |
| 2005 | 2.80 | 7.69% |
| 2006 | 4.40 | 57.14% |
| 2007 | 5.10 | 15.91% |
| 2008 | 5.60 | 9.80% |
| 2009 | 4.70 | -16.07% |
| 2010 | 6.80 | 44.68% |
| 2011 | 7.00 | 2.94% |
| 2012 | 6.50 | -7.14% |
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