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| year | consumption | change |
| 1980 | .50 | NA |
| 1981 | .50 | 0.00% |
| 1982 | .60 | 20.00% |
| 1983 | .70 | 16.67% |
| 1984 | .70 | 0.00% |
| 1985 | .80 | 14.29% |
| 1986 | .90 | 12.50% |
| 1987 | 1.10 | 22.22% |
| 1988 | 1.40 | 27.27% |
| 1989 | 1.40 | 0.00% |
| 1990 | 1.40 | 0.00% |
| 1991 | 1.40 | 0.00% |
| 1992 | 1.40 | 0.00% |
| 1993 | 1.40 | 0.00% |
| 1994 | 1.60 | 14.29% |
| 1995 | 1.70 | 6.25% |
| 1996 | 1.60 | -5.88% |
| 1997 | 1.70 | 6.25% |
| 1998 | 1.60 | -5.88% |
| 1999 | 1.70 | 6.25% |
| 2000 | 2.30 | 35.29% |
| 2001 | 2.40 | 4.35% |
| 2002 | 2.60 | 8.33% |
| 2003 | 2.90 | 11.54% |
| 2004 | 3.10 | 6.90% |
| 2005 | 3.40 | 9.68% |
| 2006 | 3.70 | 8.82% |
| 2007 | 4.10 | 10.81% |
| 2008 | 4.60 | 12.20% |
| 2009 | 4.70 | 2.17% |
| 2010 | 5.40 | 14.89% |
| 2011 | 4.20 | -22.22% |
| 2012 | 4.30 | 2.38% |
| 2013 | 5.80 | 34.88% |
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