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| year | consumption | change |
| 1986 | 4.50 | NA |
| 1987 | 4.60 | 2.22% |
| 1988 | 4.60 | 0.00% |
| 1989 | 4.40 | -4.35% |
| 1990 | 4.60 | 4.55% |
| 1991 | 4.60 | 0.00% |
| 1992 | 4.60 | 0.00% |
| 1993 | 4.50 | -2.17% |
| 1994 | 4.30 | -4.44% |
| 1995 | 4.80 | 11.63% |
| 1996 | 4.70 | -2.08% |
| 1997 | 4.80 | 2.13% |
| 1998 | 4.80 | 0.00% |
| 1999 | 4.80 | 0.00% |
| 2000 | 4.80 | 0.00% |
| 2001 | 5.90 | 22.92% |
| 2002 | 6.10 | 3.39% |
| 2003 | 7.50 | 22.95% |
| 2004 | 8.40 | 12.00% |
| 2005 | 8.50 | 1.19% |
| 2006 | 9.10 | 7.06% |
| 2007 | 9.20 | 1.10% |
| 2008 | 8.90 | -3.26% |
| 2009 | 10.00 | 12.36% |
| 2010 | 10.00 | 0.00% |
| 2011 | 12.00 | 20.00% |
| 2012 | 11.00 | -8.33% |
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