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| year | consumption | change |
| 1980 | .90 | NA |
| 1981 | .90 | 0.00% |
| 1982 | 1.00 | 11.11% |
| 1983 | 1.10 | 10.00% |
| 1984 | 1.10 | 0.00% |
| 1985 | 1.20 | 9.09% |
| 1986 | 1.20 | 0.00% |
| 1987 | 1.30 | 8.33% |
| 1988 | 1.50 | 15.38% |
| 1989 | 1.60 | 6.67% |
| 1990 | 1.70 | 6.25% |
| 1991 | 1.80 | 5.88% |
| 1992 | 2.10 | 16.67% |
| 1993 | 2.30 | 9.52% |
| 1994 | 2.40 | 4.35% |
| 1995 | 2.20 | -8.33% |
| 1996 | 2.30 | 4.55% |
| 1997 | 2.40 | 4.35% |
| 1998 | 2.60 | 8.33% |
| 1999 | 2.80 | 7.69% |
| 2000 | 3.00 | 7.14% |
| 2001 | 3.10 | 3.33% |
| 2002 | 3.40 | 9.68% |
| 2003 | 3.70 | 8.82% |
| 2004 | 3.70 | 0.00% |
| 2005 | 4.00 | 8.11% |
| 2006 | 4.20 | 5.00% |
| 2007 | 4.40 | 4.76% |
| 2008 | 4.60 | 4.55% |
| 2009 | 4.70 | 2.17% |
| 2010 | 4.80 | 2.13% |
| 2011 | 4.50 | -6.25% |
| 2012 | 4.30 | -4.44% |
| 2013 | 3.80 | -11.63% |
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