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| year | consumption | change |
| 1980 | 1.50 | NA |
| 1981 | 1.70 | 13.33% |
| 1982 | 1.80 | 5.88% |
| 1983 | 2.00 | 11.11% |
| 1984 | 1.90 | -5.00% |
| 1985 | 2.00 | 5.26% |
| 1986 | 2.20 | 10.00% |
| 1987 | 2.30 | 4.55% |
| 1988 | 2.30 | 0.00% |
| 1989 | 2.10 | -8.70% |
| 1990 | 2.20 | 4.76% |
| 1991 | 2.30 | 4.55% |
| 1992 | 2.30 | 0.00% |
| 1993 | 2.50 | 8.70% |
| 1994 | 2.60 | 4.00% |
| 1995 | 2.90 | 11.54% |
| 1996 | 3.40 | 17.24% |
| 1997 | 3.20 | -5.88% |
| 1998 | 2.80 | -12.50% |
| 1999 | 3.40 | 21.43% |
| 2000 | 3.80 | 11.76% |
| 2001 | 3.80 | 0.00% |
| 2002 | 4.00 | 5.26% |
| 2003 | 4.20 | 5.00% |
| 2004 | 4.60 | 9.52% |
| 2005 | 4.70 | 2.17% |
| 2006 | 4.80 | 2.13% |
| 2007 | 5.20 | 8.33% |
| 2008 | 5.40 | 3.85% |
| 2009 | 5.80 | 7.41% |
| 2010 | 6.10 | 5.17% |
| 2011 | 6.60 | 8.20% |
| 2012 | 7.10 | 7.58% |
| 2013 | 7.50 | 5.63% |
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