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| year | consumption | change |
| 1980 | 2.70 | NA |
| 1981 | 3.10 | 14.81% |
| 1982 | 2.90 | -6.45% |
| 1983 | 3.00 | 3.45% |
| 1984 | 3.10 | 3.33% |
| 1985 | 3.10 | 0.00% |
| 1986 | 3.30 | 6.45% |
| 1987 | 3.50 | 6.06% |
| 1988 | 3.70 | 5.71% |
| 1989 | 3.60 | -2.70% |
| 1990 | 5.10 | 41.67% |
| 1991 | 4.10 | -19.61% |
| 1992 | 4.20 | 2.44% |
| 1993 | 4.50 | 7.14% |
| 1994 | 4.70 | 4.44% |
| 1995 | 5.00 | 6.38% |
| 1996 | 5.10 | 2.00% |
| 1997 | 5.60 | 9.80% |
| 1998 | 6.30 | 12.50% |
| 1999 | 6.20 | -1.59% |
| 2000 | 6.50 | 4.84% |
| 2001 | 6.60 | 1.54% |
| 2002 | 6.10 | -7.58% |
| 2003 | 6.00 | -1.64% |
| 2004 | 6.20 | 3.33% |
| 2005 | 6.50 | 4.84% |
| 2006 | 7.30 | 12.31% |
| 2007 | 7.90 | 8.22% |
| 2008 | 8.40 | 6.33% |
| 2009 | 8.70 | 3.57% |
| 2010 | 9.30 | 6.90% |
| 2011 | 9.30 | 0.00% |
| 2012 | 9.70 | 4.30% |
| 2013 | 9.80 | 1.03% |
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