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| year | consumption | change |
| 1986 | 5.80 | NA |
| 1987 | 4.80 | -17.24% |
| 1988 | 4.20 | -12.50% |
| 1989 | 3.60 | -14.29% |
| 1990 | 3.10 | -13.89% |
| 1991 | 2.90 | -6.45% |
| 1992 | 2.60 | -10.34% |
| 1993 | 2.60 | 0.00% |
| 1994 | 2.60 | 0.00% |
| 1995 | 2.70 | 3.85% |
| 1996 | 2.90 | 7.41% |
| 1997 | 2.50 | -13.79% |
| 1998 | 2.70 | 8.00% |
| 1999 | 2.60 | -3.70% |
| 2000 | 2.40 | -7.69% |
| 2001 | 2.30 | -4.17% |
| 2002 | 2.20 | -4.35% |
| 2003 | 2.20 | 0.00% |
| 2004 | 2.40 | 9.09% |
| 2005 | 2.30 | -4.17% |
| 2006 | 2.30 | 0.00% |
| 2007 | 2.00 | -13.04% |
| 2008 | 2.00 | 0.00% |
| 2009 | 1.60 | -20.00% |
| 2010 | 1.60 | 0.00% |
| 2011 | 1.60 | 0.00% |
| 2012 | 1.50 | -6.25% |
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