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| year | consumption | change |
| 1980 | 2.90 | NA |
| 1981 | 3.00 | 3.45% |
| 1982 | 3.20 | 6.67% |
| 1983 | 3.40 | 6.25% |
| 1984 | 3.50 | 2.94% |
| 1985 | 3.50 | 0.00% |
| 1986 | 3.30 | -5.71% |
| 1987 | 3.50 | 6.06% |
| 1988 | 3.70 | 5.71% |
| 1989 | 4.00 | 8.11% |
| 1990 | 4.30 | 7.50% |
| 1991 | 4.00 | -6.98% |
| 1992 | 4.00 | 0.00% |
| 1993 | 4.00 | 0.00% |
| 1994 | 4.00 | 0.00% |
| 1995 | 4.20 | 5.00% |
| 1996 | 4.30 | 2.38% |
| 1997 | 4.40 | 2.33% |
| 1998 | 4.40 | 0.00% |
| 1999 | 4.40 | 0.00% |
| 2000 | 4.50 | 2.27% |
| 2001 | 4.50 | 0.00% |
| 2002 | 4.50 | 0.00% |
| 2003 | 4.50 | 0.00% |
| 2004 | 4.60 | 2.22% |
| 2005 | 4.60 | 0.00% |
| 2006 | 4.90 | 6.52% |
| 2007 | 4.80 | -2.04% |
| 2008 | 4.90 | 2.08% |
| 2009 | 4.90 | 0.00% |
| 2010 | 4.70 | -4.08% |
| 2011 | 4.90 | 4.26% |
| 2012 | 4.90 | 0.00% |
| 2013 | 4.90 | 0.00% |
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