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| year | consumption | change |
| 1986 | 4.70 | NA |
| 1987 | 4.30 | -8.51% |
| 1988 | 4.20 | -2.33% |
| 1989 | 3.10 | -26.19% |
| 1990 | 3.40 | 9.68% |
| 1991 | 3.40 | 0.00% |
| 1992 | 6.00 | 76.47% |
| 1993 | 4.80 | -20.00% |
| 1994 | 4.90 | 2.08% |
| 1995 | 4.60 | -6.12% |
| 1996 | 4.30 | -6.52% |
| 1997 | 4.30 | 0.00% |
| 1998 | 4.10 | -4.65% |
| 1999 | 4.20 | 2.44% |
| 2000 | 5.10 | 21.43% |
| 2001 | 3.90 | -23.53% |
| 2002 | 3.70 | -5.13% |
| 2003 | 4.50 | 21.62% |
| 2004 | 4.50 | 0.00% |
| 2005 | 5.20 | 15.56% |
| 2006 | 3.20 | -38.46% |
| 2007 | 2.80 | -12.50% |
| 2008 | 2.20 | -21.43% |
| 2009 | 2.40 | 9.09% |
| 2010 | 1.50 | -37.50% |
| 2011 | 1.60 | 6.67% |
| 2012 | 1.70 | 6.25% |
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