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| year | consumption | change |
| 1980 | 3.11 | NA |
| 1981 | 2.78 | -10.40% |
| 1982 | 2.77 | -0.58% |
| 1983 | 2.74 | -0.87% |
| 1984 | 2.90 | 5.84% |
| 1985 | 3.04 | 4.58% |
| 1986 | 3.16 | 4.18% |
| 1987 | 3.24 | 2.53% |
| 1988 | 3.24 | 0.00% |
| 1989 | 3.26 | 0.62% |
| 1990 | 3.33 | 2.12% |
| 1991 | 3.52 | 5.58% |
| 1992 | 3.49 | -0.91% |
| 1993 | 3.56 | 2.12% |
| 1994 | 3.53 | -0.81% |
| 1995 | 3.58 | 1.33% |
| 1996 | 3.73 | 4.25% |
| 1997 | 3.70 | -0.83% |
| 1998 | 3.70 | -0.05% |
| 1999 | 3.69 | -0.22% |
| 2000 | 3.79 | 2.82% |
| 2001 | 3.94 | 3.77% |
| 2002 | 3.94 | 0.15% |
| 2003 | 4.00 | 1.50% |
| 2004 | 4.11 | 2.85% |
| 2005 | 4.20 | 2.19% |
| 2006 | 4.15 | -1.31% |
| 2007 | 4.24 | 2.12% |
| 2008 | 4.21 | -0.76% |
| 2009 | 4.05 | -3.76% |
| 2010 | 4.25 | 5.04% |
| 2011 | 4.05 | -4.85% |
| 2012 | 4.03 | -0.35% |
| 2013 | 3.94 | -2.38% |
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