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| year | consumption | change |
| 1980 | 2.03 | NA |
| 1981 | 2.00 | -1.65% |
| 1982 | 1.84 | -8.04% |
| 1983 | 1.77 | -3.65% |
| 1984 | 1.87 | 5.81% |
| 1985 | 1.87 | 0.01% |
| 1986 | 1.82 | -2.98% |
| 1987 | 1.87 | 2.66% |
| 1988 | 1.86 | -0.14% |
| 1989 | 1.95 | 4.62% |
| 1990 | 1.97 | 1.13% |
| 1991 | 2.04 | 3.35% |
| 1992 | 1.99 | -2.35% |
| 1993 | 2.03 | 2.16% |
| 1994 | 2.15 | 5.75% |
| 1995 | 2.26 | 5.27% |
| 1996 | 2.33 | 2.87% |
| 1997 | 2.48 | 6.53% |
| 1998 | 2.54 | 2.30% |
| 1999 | 2.73 | 7.52% |
| 2000 | 2.73 | 0.08% |
| 2001 | 2.93 | 7.28% |
| 2002 | 2.98 | 1.77% |
| 2003 | 3.15 | 5.61% |
| 2004 | 3.32 | 5.37% |
| 2005 | 3.35 | 0.81% |
| 2006 | 3.47 | 3.71% |
| 2007 | 3.49 | 0.60% |
| 2008 | 3.37 | -3.41% |
| 2009 | 3.41 | 0.98% |
| 2010 | 3.51 | 3.08% |
| 2011 | 3.58 | 1.97% |
| 2012 | 3.57 | -0.17% |
| 2013 | 3.59 | 0.50% |
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