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| year | consumption | change |
| 1980 | 1,578.45 | NA |
| 1981 | 1,585.25 | 0.43% |
| 1982 | 1,600.85 | 0.98% |
| 1983 | 1,651.26 | 3.15% |
| 1984 | 1,740.06 | 5.38% |
| 1985 | 1,814.96 | 4.30% |
| 1986 | 1,866.46 | 2.84% |
| 1987 | 1,927.36 | 3.26% |
| 1988 | 1,969.86 | 2.21% |
| 1989 | 2,042.37 | 3.68% |
| 1990 | 2,047.97 | 0.27% |
| 1991 | 2,468.37 | 20.53% |
| 1992 | 3,632.28 | 47.15% |
| 1993 | 3,610.67 | -0.59% |
| 1994 | 3,509.28 | -2.81% |
| 1995 | 3,573.18 | 1.82% |
| 1996 | 3,627.38 | 1.52% |
| 1997 | 3,652.08 | 0.68% |
| 1998 | 3,687.39 | 0.97% |
| 1999 | 3,729.19 | 1.13% |
| 2000 | 3,852.60 | 3.31% |
| 2001 | 3,914.40 | 1.60% |
| 2002 | 3,966.30 | 1.33% |
| 2003 | 4,053.20 | 2.19% |
| 2004 | 4,157.00 | 2.56% |
| 2005 | 4,214.40 | 1.38% |
| 2006 | 4,325.20 | 2.63% |
| 2007 | 4,395.70 | 1.63% |
| 2008 | 4,423.80 | 0.64% |
| 2009 | 4,207.40 | -4.89% |
| 2010 | 4,416.50 | 4.97% |
| 2011 | 4,397.10 | -0.44% |
| 2012 | 4,425.50 | 0.65% |
| 2013 | 4,377.70 | -1.08% |
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