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| year | consumption | change |
| 1980 | 1.40 | NA |
| 1981 | 1.60 | 14.29% |
| 1982 | 1.60 | 0.00% |
| 1983 | 1.70 | 6.25% |
| 1984 | 1.30 | -23.53% |
| 1985 | 1.70 | 30.77% |
| 1986 | 1.70 | 0.00% |
| 1987 | 2.00 | 17.65% |
| 1988 | 1.90 | -5.00% |
| 1989 | 2.10 | 10.53% |
| 1990 | 1.90 | -9.52% |
| 1991 | 1.50 | -21.05% |
| 1992 | 1.30 | -13.33% |
| 1993 | 1.80 | 38.46% |
| 1994 | 2.00 | 11.11% |
| 1995 | 2.50 | 25.00% |
| 1996 | 2.30 | -8.00% |
| 1997 | 2.50 | 8.70% |
| 1998 | 2.70 | 8.00% |
| 1999 | 2.60 | -3.70% |
| 2000 | 2.70 | 3.85% |
| 2001 | 2.90 | 7.41% |
| 2002 | 2.80 | -3.45% |
| 2003 | 2.90 | 3.57% |
| 2004 | 2.90 | 0.00% |
| 2005 | 2.90 | 0.00% |
| 2006 | 3.20 | 10.34% |
| 2007 | 3.30 | 3.13% |
| 2008 | 3.60 | 9.09% |
| 2009 | 3.80 | 5.56% |
| 2010 | 4.10 | 7.89% |
| 2011 | 3.90 | -4.88% |
| 2012 | 4.70 | 20.51% |
| 2013 | 4.90 | 4.26% |
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