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| year | consumption | change |
| 1980 | 1.40 | NA |
| 1981 | 1.50 | 7.14% |
| 1982 | 1.70 | 13.33% |
| 1983 | 1.70 | 0.00% |
| 1984 | 1.90 | 11.76% |
| 1985 | 2.00 | 5.26% |
| 1986 | 2.20 | 10.00% |
| 1987 | 2.20 | 0.00% |
| 1988 | 2.30 | 4.55% |
| 1989 | 2.30 | 0.00% |
| 1990 | 2.60 | 13.04% |
| 1991 | 2.70 | 3.85% |
| 1992 | 2.60 | -3.70% |
| 1993 | 3.20 | 23.08% |
| 1994 | 3.60 | 12.50% |
| 1995 | 3.90 | 8.33% |
| 1996 | 3.60 | -7.69% |
| 1997 | 4.10 | 13.89% |
| 1998 | 4.50 | 9.76% |
| 1999 | 4.70 | 4.44% |
| 2000 | 5.00 | 6.38% |
| 2001 | 5.30 | 6.00% |
| 2002 | 5.50 | 3.77% |
| 2003 | 6.00 | 9.09% |
| 2004 | 6.50 | 8.33% |
| 2005 | 7.40 | 13.85% |
| 2006 | 6.90 | -6.76% |
| 2007 | 7.90 | 14.49% |
| 2008 | 8.10 | 2.53% |
| 2009 | 8.20 | 1.23% |
| 2010 | 9.00 | 9.76% |
| 2011 | 9.80 | 8.89% |
| 2012 | 10.00 | 2.04% |
| 2013 | 10.00 | 0.00% |
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