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| year | consumption | change |
| 1986 | 4.50 | NA |
| 1987 | 3.30 | -26.67% |
| 1988 | 4.00 | 21.21% |
| 1989 | 4.70 | 17.50% |
| 1990 | 4.80 | 2.13% |
| 1991 | 4.00 | -16.67% |
| 1992 | 4.30 | 7.50% |
| 1993 | 6.00 | 39.53% |
| 1994 | 4.10 | -31.67% |
| 1995 | 5.10 | 24.39% |
| 1996 | 5.20 | 1.96% |
| 1997 | 6.00 | 15.38% |
| 1998 | 5.90 | -1.67% |
| 1999 | 5.60 | -5.08% |
| 2000 | 4.00 | -28.57% |
| 2001 | 5.20 | 30.00% |
| 2002 | 3.70 | -28.85% |
| 2003 | 4.90 | 32.43% |
| 2004 | 5.10 | 4.08% |
| 2005 | 5.20 | 1.96% |
| 2006 | 7.20 | 38.46% |
| 2007 | 8.50 | 18.06% |
| 2008 | 11.00 | 29.41% |
| 2009 | 7.30 | -33.64% |
| 2010 | 9.50 | 30.14% |
| 2011 | 9.70 | 2.11% |
| 2012 | 9.70 | 0.00% |
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