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| year | consumption | change |
| 1980 | .50 | NA |
| 1981 | .60 | 20.00% |
| 1982 | .60 | 0.00% |
| 1983 | .70 | 16.67% |
| 1984 | .80 | 14.29% |
| 1985 | .80 | 0.00% |
| 1986 | .80 | 0.00% |
| 1987 | .80 | 0.00% |
| 1988 | .80 | 0.00% |
| 1989 | .90 | 12.50% |
| 1990 | .90 | 0.00% |
| 1991 | .90 | 0.00% |
| 1992 | .90 | 0.00% |
| 1993 | 1.00 | 11.11% |
| 1994 | .80 | -20.00% |
| 1995 | .90 | 12.50% |
| 1996 | .90 | 0.00% |
| 1997 | 1.00 | 11.11% |
| 1998 | 1.00 | 0.00% |
| 1999 | 1.00 | 0.00% |
| 2000 | 1.00 | 0.00% |
| 2001 | 1.10 | 10.00% |
| 2002 | 1.20 | 9.09% |
| 2003 | 1.20 | 0.00% |
| 2004 | 1.20 | 0.00% |
| 2005 | 1.20 | 0.00% |
| 2006 | 1.30 | 8.33% |
| 2007 | 1.40 | 7.69% |
| 2008 | 1.40 | 0.00% |
| 2009 | 1.40 | 0.00% |
| 2010 | 1.50 | 7.14% |
| 2011 | 1.60 | 6.67% |
| 2012 | 1.70 | 6.25% |
| 2013 | 1.80 | 5.88% |
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