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| year | consumption | change |
| 1986 | 4.10 | NA |
| 1987 | 3.00 | -26.83% |
| 1988 | 3.80 | 26.67% |
| 1989 | 4.40 | 15.79% |
| 1990 | 4.10 | -6.82% |
| 1991 | 4.90 | 19.51% |
| 1992 | 5.00 | 2.04% |
| 1993 | 5.10 | 2.00% |
| 1994 | 5.30 | 3.92% |
| 1995 | 4.50 | -15.09% |
| 1996 | 4.60 | 2.22% |
| 1997 | 5.50 | 19.57% |
| 1998 | 5.20 | -5.45% |
| 1999 | 3.60 | -30.77% |
| 2000 | 3.70 | 2.78% |
| 2001 | 2.60 | -29.73% |
| 2002 | 2.40 | -7.69% |
| 2003 | 2.40 | 0.00% |
| 2004 | 2.40 | 0.00% |
| 2005 | 2.60 | 8.33% |
| 2006 | 2.40 | -7.69% |
| 2007 | 3.80 | 58.33% |
| 2008 | 4.50 | 18.42% |
| 2009 | 4.60 | 2.22% |
| 2010 | 5.30 | 15.22% |
| 2011 | 5.90 | 11.32% |
| 2012 | 6.00 | 1.69% |
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