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| year | consumption | change |
| 1980 | 1.70 | NA |
| 1981 | 1.80 | 5.88% |
| 1982 | 1.80 | 0.00% |
| 1983 | 2.20 | 22.22% |
| 1984 | 2.30 | 4.55% |
| 1985 | 2.50 | 8.70% |
| 1986 | 2.30 | -8.00% |
| 1987 | 2.40 | 4.35% |
| 1988 | 2.60 | 8.33% |
| 1989 | 2.70 | 3.85% |
| 1990 | 2.90 | 7.41% |
| 1991 | 3.00 | 3.45% |
| 1992 | 3.00 | 0.00% |
| 1993 | 3.30 | 10.00% |
| 1994 | 3.30 | 0.00% |
| 1995 | 3.50 | 6.06% |
| 1996 | 3.60 | 2.86% |
| 1997 | 3.60 | 0.00% |
| 1998 | 3.70 | 2.78% |
| 1999 | 3.50 | -5.41% |
| 2000 | 3.40 | -2.86% |
| 2001 | 3.80 | 11.76% |
| 2002 | 3.90 | 2.63% |
| 2003 | 4.20 | 7.69% |
| 2004 | 4.60 | 9.52% |
| 2005 | 4.80 | 4.35% |
| 2006 | 5.20 | 8.33% |
| 2007 | 5.40 | 3.85% |
| 2008 | 5.40 | 0.00% |
| 2009 | 5.50 | 1.85% |
| 2010 | 6.00 | 9.09% |
| 2011 | 6.20 | 3.33% |
| 2012 | 6.50 | 4.84% |
| 2013 | 6.90 | 6.15% |
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