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| year | consumption | change |
| 1980 | 1.08 | NA |
| 1981 | 1.07 | -1.39% |
| 1982 | 1.01 | -5.44% |
| 1983 | 1.02 | 0.69% |
| 1984 | 1.05 | 3.05% |
| 1985 | 1.07 | 1.81% |
| 1986 | 1.07 | 0.09% |
| 1987 | 1.02 | -4.69% |
| 1988 | 1.10 | 7.96% |
| 1989 | 1.11 | 1.46% |
| 1990 | 1.15 | 3.41% |
| 1991 | 1.21 | 4.60% |
| 1992 | 1.19 | -1.49% |
| 1993 | 1.23 | 3.20% |
| 1994 | 1.22 | -0.73% |
| 1995 | 1.27 | 4.11% |
| 1996 | 1.32 | 4.58% |
| 1997 | 1.34 | 0.83% |
| 1998 | 1.36 | 2.10% |
| 1999 | 1.37 | 0.51% |
| 2000 | 1.35 | -1.17% |
| 2001 | 1.41 | 4.36% |
| 2002 | 1.42 | 0.14% |
| 2003 | 1.43 | 1.34% |
| 2004 | 1.48 | 3.00% |
| 2005 | 1.53 | 3.45% |
| 2006 | 1.52 | -0.52% |
| 2007 | 1.50 | -1.18% |
| 2008 | 1.50 | -0.20% |
| 2009 | 1.44 | -3.87% |
| 2010 | 1.49 | 3.47% |
| 2011 | 1.40 | -5.97% |
| 2012 | 1.44 | 2.85% |
| 2013 | 1.46 | 1.25% |
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