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| year | consumption | change |
| 1986 | 4.20 | NA |
| 1987 | 4.20 | 0.00% |
| 1988 | 4.50 | 7.14% |
| 1989 | 4.70 | 4.44% |
| 1990 | 5.00 | 6.38% |
| 1991 | 5.10 | 2.00% |
| 1992 | 5.40 | 5.88% |
| 1993 | 5.40 | 0.00% |
| 1994 | 5.50 | 1.85% |
| 1995 | 5.80 | 5.45% |
| 1996 | 5.70 | -1.72% |
| 1997 | 5.20 | -8.77% |
| 1998 | 7.50 | 44.23% |
| 1999 | 7.90 | 5.33% |
| 2000 | 7.90 | 0.00% |
| 2001 | 8.80 | 11.39% |
| 2002 | 9.40 | 6.82% |
| 2003 | 9.60 | 2.13% |
| 2004 | 11.00 | 14.58% |
| 2005 | 11.00 | 0.00% |
| 2006 | 8.80 | -20.00% |
| 2007 | 12.00 | 36.36% |
| 2008 | 13.00 | 8.33% |
| 2009 | 15.00 | 15.38% |
| 2010 | 15.00 | 0.00% |
| 2011 | 14.00 | -6.67% |
| 2012 | 16.00 | 14.29% |
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