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| year | consumption | change |
| 1980 | 2.50 | NA |
| 1981 | 3.00 | 20.00% |
| 1982 | 2.40 | -20.00% |
| 1983 | 2.30 | -4.17% |
| 1984 | 3.20 | 39.13% |
| 1985 | 3.20 | 0.00% |
| 1986 | 3.50 | 9.38% |
| 1987 | 3.10 | -11.43% |
| 1988 | 3.30 | 6.45% |
| 1989 | 2.40 | -27.27% |
| 1990 | 2.60 | 8.33% |
| 1991 | 2.70 | 3.85% |
| 1992 | 2.40 | -11.11% |
| 1993 | 3.70 | 54.17% |
| 1994 | 3.20 | -13.51% |
| 1995 | 3.60 | 12.50% |
| 1996 | 4.70 | 30.56% |
| 1997 | 4.80 | 2.13% |
| 1998 | 5.20 | 8.33% |
| 1999 | 6.50 | 25.00% |
| 2000 | 5.80 | -10.77% |
| 2001 | 8.50 | 46.55% |
| 2002 | 8.70 | 2.35% |
| 2003 | 9.20 | 5.75% |
| 2004 | 8.00 | -13.04% |
| 2005 | 11.00 | 37.50% |
| 2006 | 11.00 | 0.00% |
| 2007 | 12.00 | 9.09% |
| 2008 | 10.00 | -16.67% |
| 2009 | 9.90 | -1.00% |
| 2010 | 10.00 | 1.01% |
| 2011 | 11.00 | 10.00% |
| 2012 | 12.00 | 9.09% |
| 2013 | 12.00 | 0.00% |
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