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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 | 3.60 | 5.88% |
| 1985 | 3.50 | -2.78% |
| 1986 | 3.70 | 5.71% |
| 1987 | 3.70 | 0.00% |
| 1988 | 4.00 | 8.11% |
| 1989 | 4.10 | 2.50% |
| 1990 | 4.10 | 0.00% |
| 1991 | 4.10 | 0.00% |
| 1992 | 4.20 | 2.44% |
| 1993 | 4.40 | 4.76% |
| 1994 | 4.50 | 2.27% |
| 1995 | 4.60 | 2.22% |
| 1996 | 4.60 | 0.00% |
| 1997 | 5.10 | 10.87% |
| 1998 | 5.80 | 13.73% |
| 1999 | 6.70 | 15.52% |
| 2000 | 7.30 | 8.96% |
| 2001 | 7.60 | 4.11% |
| 2002 | 8.00 | 5.26% |
| 2003 | 7.90 | -1.25% |
| 2004 | 8.20 | 3.80% |
| 2005 | 8.20 | 0.00% |
| 2006 | 9.40 | 14.63% |
| 2007 | 11.00 | 17.02% |
| 2008 | 16.00 | 45.45% |
| 2009 | 16.00 | 0.00% |
| 2010 | 16.00 | 0.00% |
| 2011 | 17.00 | 6.25% |
| 2012 | 17.00 | 0.00% |
| 2013 | 17.00 | 0.00% |
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