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| year | consumption | change |
| 1980 | 6.44 | NA |
| 1981 | 6.72 | 4.44% |
| 1982 | 7.54 | 12.20% |
| 1983 | 7.86 | 4.16% |
| 1984 | 8.33 | 6.06% |
| 1985 | 8.45 | 1.45% |
| 1986 | 8.82 | 4.29% |
| 1987 | 9.02 | 2.32% |
| 1988 | 9.38 | 4.00% |
| 1989 | 9.22 | -1.71% |
| 1990 | 9.14 | -0.91% |
| 1991 | 9.73 | 6.52% |
| 1992 | 9.42 | -3.18% |
| 1993 | 9.96 | 5.63% |
| 1994 | 10.28 | 3.22% |
| 1995 | 10.58 | 2.91% |
| 1996 | 10.79 | 2.01% |
| 1997 | 11.19 | 3.72% |
| 1998 | 11.08 | -0.98% |
| 1999 | 11.66 | 5.21% |
| 2000 | 11.85 | 1.62% |
| 2001 | 12.40 | 4.68% |
| 2002 | 12.26 | -1.11% |
| 2003 | 12.99 | 5.95% |
| 2004 | 13.67 | 5.20% |
| 2005 | 14.26 | 4.29% |
| 2006 | 14.37 | 0.83% |
| 2007 | 14.70 | 2.27% |
| 2008 | 15.96 | 8.56% |
| 2009 | 15.73 | -1.44% |
| 2010 | 16.21 | 3.05% |
| 2011 | 16.55 | 2.10% |
| 2012 | 17.78 | 7.46% |
| 2013 | 17.51 | -1.55% |
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