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| year | consumption | change |
| 1980 | 1.40 | NA |
| 1981 | 1.50 | 7.14% |
| 1982 | 1.50 | 0.00% |
| 1983 | 1.50 | 0.00% |
| 1984 | 1.40 | -6.67% |
| 1985 | 1.30 | -7.14% |
| 1986 | 1.30 | 0.00% |
| 1987 | 1.30 | 0.00% |
| 1988 | 1.60 | 23.08% |
| 1989 | 1.70 | 6.25% |
| 1990 | 1.80 | 5.88% |
| 1991 | 2.00 | 11.11% |
| 1992 | 2.00 | 0.00% |
| 1993 | 2.00 | 0.00% |
| 1994 | 2.40 | 20.00% |
| 1995 | 2.50 | 4.17% |
| 1996 | 2.70 | 8.00% |
| 1997 | 2.90 | 7.41% |
| 1998 | 3.10 | 6.90% |
| 1999 | 3.30 | 6.45% |
| 2000 | 3.40 | 3.03% |
| 2001 | 3.40 | 0.00% |
| 2002 | 3.50 | 2.94% |
| 2003 | 3.60 | 2.86% |
| 2004 | 3.80 | 5.56% |
| 2005 | 4.20 | 10.53% |
| 2006 | 4.50 | 7.14% |
| 2007 | 4.90 | 8.89% |
| 2008 | 4.90 | 0.00% |
| 2009 | 5.20 | 6.12% |
| 2010 | 5.70 | 9.62% |
| 2011 | 6.10 | 7.02% |
| 2012 | 6.50 | 6.56% |
| 2013 | 7.00 | 7.69% |
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