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| year | consumption | change |
| 1980 | 1.40 | NA |
| 1981 | 1.50 | 7.14% |
| 1982 | 1.50 | 0.00% |
| 1983 | 1.40 | -6.67% |
| 1984 | 1.60 | 14.29% |
| 1985 | 1.50 | -6.25% |
| 1986 | 1.60 | 6.67% |
| 1987 | 1.60 | 0.00% |
| 1988 | 1.70 | 6.25% |
| 1989 | 1.70 | 0.00% |
| 1990 | 1.70 | 0.00% |
| 1991 | 1.60 | -5.88% |
| 1992 | 1.70 | 6.25% |
| 1993 | 2.00 | 17.65% |
| 1994 | 2.40 | 20.00% |
| 1995 | 2.80 | 16.67% |
| 1996 | 2.90 | 3.57% |
| 1997 | 3.10 | 6.90% |
| 1998 | 3.20 | 3.23% |
| 1999 | 3.40 | 6.25% |
| 2000 | 4.10 | 20.59% |
| 2001 | 3.90 | -4.88% |
| 2002 | 3.80 | -2.56% |
| 2003 | 4.00 | 5.26% |
| 2004 | 4.00 | 0.00% |
| 2005 | 4.50 | 12.50% |
| 2006 | 4.90 | 8.89% |
| 2007 | 5.30 | 8.16% |
| 2008 | 5.30 | 0.00% |
| 2009 | 5.30 | 0.00% |
| 2010 | 5.40 | 1.89% |
| 2011 | 5.40 | 0.00% |
| 2012 | 5.70 | 5.56% |
| 2013 | 5.90 | 3.51% |
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