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| year | consumption | change |
| 1986 | 5.10 | NA |
| 1987 | 5.40 | 5.88% |
| 1988 | 4.90 | -9.26% |
| 1989 | 4.10 | -16.33% |
| 1990 | 3.40 | -17.07% |
| 1991 | 3.20 | -5.88% |
| 1992 | 3.30 | 3.13% |
| 1993 | 3.30 | 0.00% |
| 1994 | 3.60 | 9.09% |
| 1995 | 3.50 | -2.78% |
| 1996 | 4.00 | 14.29% |
| 1997 | 3.70 | -7.50% |
| 1998 | 3.40 | -8.11% |
| 1999 | 3.30 | -2.94% |
| 2000 | 2.50 | -24.24% |
| 2001 | 2.70 | 8.00% |
| 2002 | 2.80 | 3.70% |
| 2003 | 3.20 | 14.29% |
| 2004 | 2.70 | -15.63% |
| 2005 | 2.20 | -18.52% |
| 2006 | 2.20 | 0.00% |
| 2007 | 1.80 | -18.18% |
| 2008 | 1.30 | -27.78% |
| 2009 | 1.20 | -7.69% |
| 2010 | 1.40 | 16.67% |
| 2011 | 1.00 | -28.57% |
| 2012 | .70 | -30.00% |
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