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| year | consumption | change |
| 1986 | 1.70 | NA |
| 1987 | 2.50 | 47.06% |
| 1988 | 2.80 | 12.00% |
| 1989 | 3.60 | 28.57% |
| 1990 | 2.80 | -22.22% |
| 1991 | 1.90 | -32.14% |
| 1992 | 1.40 | -26.32% |
| 1993 | 1.90 | 35.71% |
| 1994 | 1.80 | -5.26% |
| 1995 | 1.70 | -5.56% |
| 1996 | 1.80 | 5.88% |
| 1997 | 1.80 | 0.00% |
| 1998 | 1.80 | 0.00% |
| 1999 | 1.80 | 0.00% |
| 2000 | 1.80 | 0.00% |
| 2001 | 1.80 | 0.00% |
| 2002 | 1.80 | 0.00% |
| 2003 | 1.90 | 5.56% |
| 2004 | 2.10 | 10.53% |
| 2005 | 2.50 | 19.05% |
| 2006 | 2.20 | -12.00% |
| 2007 | 1.80 | -18.18% |
| 2008 | .50 | -72.22% |
| 2009 | .80 | 60.00% |
| 2010 | .80 | 0.00% |
| 2011 | .80 | 0.00% |
| 2012 | .80 | 0.00% |
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