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| year | consumption | change |
| 1986 | 3.10 | NA |
| 1987 | 3.60 | 16.13% |
| 1988 | 4.00 | 11.11% |
| 1989 | 4.90 | 22.50% |
| 1990 | 3.70 | -24.49% |
| 1991 | 4.70 | 27.03% |
| 1992 | 5.50 | 17.02% |
| 1993 | 5.90 | 7.27% |
| 1994 | 5.80 | -1.69% |
| 1995 | 5.80 | 0.00% |
| 1996 | 6.80 | 17.24% |
| 1997 | 6.80 | 0.00% |
| 1998 | 6.20 | -8.82% |
| 1999 | 5.40 | -12.90% |
| 2000 | 4.50 | -16.67% |
| 2001 | 3.80 | -15.56% |
| 2002 | 3.50 | -7.89% |
| 2003 | 2.60 | -25.71% |
| 2004 | 2.30 | -11.54% |
| 2005 | 1.90 | -17.39% |
| 2006 | 1.40 | -26.32% |
| 2007 | 2.00 | 42.86% |
| 2008 | 1.70 | -15.00% |
| 2009 | 2.60 | 52.94% |
| 2010 | 1.90 | -26.92% |
| 2011 | 2.50 | 31.58% |
| 2012 | 2.10 | -16.00% |
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