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| year | consumption | change |
| 1980 | 9.86 | NA |
| 1981 | 9.58 | -2.88% |
| 1982 | 9.08 | -5.22% |
| 1983 | 9.07 | -0.07% |
| 1984 | 9.75 | 7.43% |
| 1985 | 10.12 | 3.79% |
| 1986 | 10.22 | 1.02% |
| 1987 | 10.56 | 3.34% |
| 1988 | 11.01 | 4.26% |
| 1989 | 11.16 | 1.36% |
| 1990 | 10.96 | -1.83% |
| 1991 | 11.06 | 0.95% |
| 1992 | 11.42 | 3.22% |
| 1993 | 11.67 | 2.22% |
| 1994 | 11.99 | 2.75% |
| 1995 | 12.17 | 1.51% |
| 1996 | 12.52 | 2.84% |
| 1997 | 12.61 | 0.73% |
| 1998 | 12.31 | -2.41% |
| 1999 | 12.92 | 5.01% |
| 2000 | 13.01 | 0.68% |
| 2001 | 12.76 | -1.90% |
| 2002 | 13.00 | 1.86% |
| 2003 | 13.35 | 2.69% |
| 2004 | 13.68 | 2.45% |
| 2005 | 13.58 | -0.73% |
| 2006 | 13.69 | 0.85% |
| 2007 | 13.57 | -0.89% |
| 2008 | 13.56 | -0.10% |
| 2009 | 13.06 | -3.69% |
| 2010 | 13.55 | 3.76% |
| 2011 | 13.86 | 2.34% |
| 2012 | 13.79 | -0.53% |
| 2013 | 14.19 | 2.93% |
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