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| year | consumption | change |
| 1980 | 1.10 | NA |
| 1981 | 2.50 | 127.27% |
| 1982 | 2.40 | -4.00% |
| 1983 | 2.70 | 12.50% |
| 1984 | 4.40 | 62.96% |
| 1985 | 4.50 | 2.27% |
| 1986 | 4.50 | 0.00% |
| 1987 | 4.50 | 0.00% |
| 1988 | 4.60 | 2.22% |
| 1989 | 4.70 | 2.17% |
| 1990 | 4.90 | 4.26% |
| 1991 | 4.90 | 0.00% |
| 1992 | 5.10 | 4.08% |
| 1993 | 4.60 | -9.80% |
| 1994 | 4.70 | 2.17% |
| 1995 | 4.80 | 2.13% |
| 1996 | 4.80 | 0.00% |
| 1997 | 4.80 | 0.00% |
| 1998 | 4.90 | 2.08% |
| 1999 | 4.90 | 0.00% |
| 2000 | 5.20 | 6.12% |
| 2001 | 5.20 | 0.00% |
| 2002 | 5.30 | 1.92% |
| 2003 | 5.30 | 0.00% |
| 2004 | 5.20 | -1.89% |
| 2005 | 5.50 | 5.77% |
| 2006 | 5.60 | 1.82% |
| 2007 | 5.10 | -8.93% |
| 2008 | 5.10 | 0.00% |
| 2009 | 5.30 | 3.92% |
| 2010 | 5.30 | 0.00% |
| 2011 | 5.30 | 0.00% |
| 2012 | 5.30 | 0.00% |
| 2013 | 5.30 | 0.00% |
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