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| year | consumption | change |
| 1980 | 1.70 | NA |
| 1981 | 2.00 | 17.65% |
| 1982 | 2.40 | 20.00% |
| 1983 | 2.40 | 0.00% |
| 1984 | 2.50 | 4.17% |
| 1985 | 2.40 | -4.00% |
| 1986 | 2.80 | 16.67% |
| 1987 | 2.90 | 3.57% |
| 1988 | 3.00 | 3.45% |
| 1989 | 2.90 | -3.33% |
| 1990 | 3.10 | 6.90% |
| 1991 | 3.00 | -3.23% |
| 1992 | 3.30 | 10.00% |
| 1993 | 3.30 | 0.00% |
| 1994 | 3.40 | 3.03% |
| 1995 | 3.60 | 5.88% |
| 1996 | 3.80 | 5.56% |
| 1997 | 4.30 | 13.16% |
| 1998 | 4.40 | 2.33% |
| 1999 | 4.50 | 2.27% |
| 2000 | 4.70 | 4.44% |
| 2001 | 4.90 | 4.26% |
| 2002 | 4.90 | 0.00% |
| 2003 | 5.70 | 16.33% |
| 2004 | 5.70 | 0.00% |
| 2005 | 6.20 | 8.77% |
| 2006 | 6.50 | 4.84% |
| 2007 | 7.00 | 7.69% |
| 2008 | 7.00 | 0.00% |
| 2009 | 7.10 | 1.43% |
| 2010 | 7.70 | 8.45% |
| 2011 | 8.00 | 3.90% |
| 2012 | 8.30 | 3.75% |
| 2013 | 8.70 | 4.82% |
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