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| year | consumption | change |
| 1980 | 1.80 | NA |
| 1981 | 1.50 | -16.67% |
| 1982 | 1.40 | -6.67% |
| 1983 | 1.40 | 0.00% |
| 1984 | 1.40 | 0.00% |
| 1985 | 1.40 | 0.00% |
| 1986 | 1.60 | 14.29% |
| 1987 | 1.70 | 6.25% |
| 1988 | 1.80 | 5.88% |
| 1989 | 2.00 | 11.11% |
| 1990 | 2.30 | 15.00% |
| 1991 | 2.50 | 8.70% |
| 1992 | 2.50 | 0.00% |
| 1993 | 2.50 | 0.00% |
| 1994 | 2.70 | 8.00% |
| 1995 | 3.00 | 11.11% |
| 1996 | 2.70 | -10.00% |
| 1997 | 2.60 | -3.70% |
| 1998 | 3.30 | 26.92% |
| 1999 | 4.20 | 27.27% |
| 2000 | 3.80 | -9.52% |
| 2001 | 4.20 | 10.53% |
| 2002 | 4.40 | 4.76% |
| 2003 | 6.20 | 40.91% |
| 2004 | 5.20 | -16.13% |
| 2005 | 6.50 | 25.00% |
| 2006 | 7.30 | 12.31% |
| 2007 | 7.70 | 5.48% |
| 2008 | 7.20 | -6.49% |
| 2009 | 7.40 | 2.78% |
| 2010 | 7.70 | 4.05% |
| 2011 | 7.80 | 1.30% |
| 2012 | 7.90 | 1.28% |
| 2013 | 8.50 | 7.59% |
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