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| year | consumption | change |
| 1980 | 1.66 | NA |
| 1981 | 2.03 | 21.77% |
| 1982 | 1.97 | -2.86% |
| 1983 | 2.12 | 7.93% |
| 1984 | 2.47 | 16.20% |
| 1985 | 2.71 | 9.85% |
| 1986 | 3.02 | 11.25% |
| 1987 | 3.07 | 1.92% |
| 1988 | 3.18 | 3.61% |
| 1989 | 3.13 | -1.82% |
| 1990 | 3.35 | 7.07% |
| 1991 | 3.50 | 4.54% |
| 1992 | 3.66 | 4.72% |
| 1993 | 3.78 | 3.06% |
| 1994 | 3.90 | 3.28% |
| 1995 | 3.83 | -1.90% |
| 1996 | 4.10 | 7.27% |
| 1997 | 4.37 | 6.38% |
| 1998 | 4.54 | 4.05% |
| 1999 | 4.60 | 1.30% |
| 2000 | 4.85 | 5.45% |
| 2001 | 5.14 | 5.89% |
| 2002 | 5.38 | 4.77% |
| 2003 | 5.76 | 7.00% |
| 2004 | 6.21 | 7.76% |
| 2005 | 6.53 | 5.12% |
| 2006 | 6.85 | 4.90% |
| 2007 | 6.90 | 0.73% |
| 2008 | 7.41 | 7.51% |
| 2009 | 7.67 | 3.49% |
| 2010 | 8.32 | 8.43% |
| 2011 | 8.86 | 6.48% |
| 2012 | 9.66 | 9.05% |
| 2013 | 9.65 | -0.11% |
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