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| year | consumption | change |
| 1986 | 1.20 | NA |
| 1987 | 1.60 | 33.33% |
| 1988 | 1.60 | 0.00% |
| 1989 | 1.80 | 12.50% |
| 1990 | 1.90 | 5.56% |
| 1991 | 2.20 | 15.79% |
| 1992 | 2.30 | 4.55% |
| 1993 | 2.30 | 0.00% |
| 1994 | 2.50 | 8.70% |
| 1995 | 2.60 | 4.00% |
| 1996 | 3.10 | 19.23% |
| 1997 | 3.10 | 0.00% |
| 1998 | 3.20 | 3.23% |
| 1999 | 3.10 | -3.13% |
| 2000 | 3.00 | -3.23% |
| 2001 | 3.00 | 0.00% |
| 2002 | 3.10 | 3.33% |
| 2003 | 3.30 | 6.45% |
| 2004 | 3.50 | 6.06% |
| 2005 | 3.50 | 0.00% |
| 2006 | 3.70 | 5.71% |
| 2007 | 3.90 | 5.41% |
| 2008 | 4.40 | 12.82% |
| 2009 | 4.80 | 9.09% |
| 2010 | 5.20 | 8.33% |
| 2011 | 6.10 | 17.31% |
| 2012 | 6.30 | 3.28% |
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