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| year | consumption | change |
| 1980 | 15.55 | NA |
| 1981 | 15.18 | -2.40% |
| 1982 | 14.63 | -3.60% |
| 1983 | 14.34 | -2.02% |
| 1984 | 15.66 | 9.20% |
| 1985 | 15.70 | 0.30% |
| 1986 | 15.82 | 0.73% |
| 1987 | 16.15 | 2.12% |
| 1988 | 17.17 | 6.30% |
| 1989 | 17.69 | 3.01% |
| 1990 | 18.69 | 5.66% |
| 1991 | 19.38 | 3.69% |
| 1992 | 19.42 | 0.18% |
| 1993 | 20.18 | 3.91% |
| 1994 | 20.35 | 0.84% |
| 1995 | 20.98 | 3.13% |
| 1996 | 21.38 | 1.92% |
| 1997 | 21.89 | 2.35% |
| 1998 | 21.47 | -1.92% |
| 1999 | 21.93 | 2.18% |
| 2000 | 22.43 | 2.26% |
| 2001 | 22.24 | -0.83% |
| 2002 | 22.06 | -0.82% |
| 2003 | 22.07 | 0.05% |
| 2004 | 23.00 | 4.21% |
| 2005 | 22.44 | -2.43% |
| 2006 | 22.86 | 1.88% |
| 2007 | 22.76 | -0.47% |
| 2008 | 22.08 | -2.96% |
| 2009 | 20.56 | -6.88% |
| 2010 | 22.13 | 7.63% |
| 2011 | 20.85 | -5.80% |
| 2012 | 20.34 | -2.44% |
| 2013 | 20.37 | 0.15% |
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