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| year | consumption | change |
| 1980 | 2.74 | NA |
| 1981 | 2.72 | -0.40% |
| 1982 | 2.86 | 4.85% |
| 1983 | 2.93 | 2.49% |
| 1984 | 2.85 | -2.63% |
| 1985 | 2.88 | 0.88% |
| 1986 | 2.96 | 2.89% |
| 1987 | 3.05 | 2.94% |
| 1988 | 3.01 | -1.15% |
| 1989 | 3.11 | 3.16% |
| 1990 | 2.81 | -9.57% |
| 1991 | 2.20 | -21.72% |
| 1992 | 2.05 | -6.60% |
| 1993 | 1.96 | -4.77% |
| 1994 | 1.88 | -3.99% |
| 1995 | 2.02 | 7.67% |
| 1996 | 2.05 | 1.53% |
| 1997 | 2.03 | -1.12% |
| 1998 | 1.74 | -14.39% |
| 1999 | 1.59 | -8.41% |
| 2000 | 1.59 | -0.38% |
| 2001 | 1.71 | 8.01% |
| 2002 | 1.68 | -1.93% |
| 2003 | 1.62 | -3.51% |
| 2004 | 1.68 | 3.89% |
| 2005 | 1.66 | -1.43% |
| 2006 | 1.67 | 0.42% |
| 2007 | 1.65 | -0.72% |
| 2008 | 1.66 | 0.48% |
| 2009 | 1.40 | -15.70% |
| 2010 | 1.41 | 0.29% |
| 2011 | 1.42 | 1.28% |
| 2012 | 1.42 | -0.28% |
| 2013 | 1.38 | -2.54% |
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