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| year | consumption | change |
| 1980 | 2.10 | NA |
| 1981 | 1.87 | -10.93% |
| 1982 | 1.76 | -6.19% |
| 1983 | 1.74 | -0.85% |
| 1984 | 1.83 | 4.70% |
| 1985 | 1.90 | 4.33% |
| 1986 | 1.98 | 3.83% |
| 1987 | 2.05 | 3.79% |
| 1988 | 2.12 | 3.17% |
| 1989 | 2.16 | 1.79% |
| 1990 | 2.20 | 1.90% |
| 1991 | 2.28 | 3.69% |
| 1992 | 2.25 | -1.23% |
| 1993 | 2.24 | -0.36% |
| 1994 | 2.35 | 4.86% |
| 1995 | 2.41 | 2.64% |
| 1996 | 2.57 | 6.59% |
| 1997 | 2.64 | 2.64% |
| 1998 | 2.68 | 1.71% |
| 1999 | 2.64 | -1.49% |
| 2000 | 2.72 | 2.87% |
| 2001 | 2.68 | -1.43% |
| 2002 | 2.67 | -0.56% |
| 2003 | 2.78 | 4.35% |
| 2004 | 2.81 | 1.11% |
| 2005 | 2.77 | -1.39% |
| 2006 | 2.75 | -0.90% |
| 2007 | 2.75 | -0.04% |
| 2008 | 2.88 | 4.91% |
| 2009 | 2.67 | -7.56% |
| 2010 | 2.85 | 6.87% |
| 2011 | 2.68 | -5.97% |
| 2012 | 2.55 | -4.67% |
| 2013 | 2.61 | 2.31% |
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