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| year | consumption | change |
| 1980 | 1,133.01 | NA |
| 1981 | 1,164.83 | 2.81% |
| 1982 | 1,228.63 | 5.48% |
| 1983 | 1,316.83 | 7.18% |
| 1984 | 1,418.83 | 7.75% |
| 1985 | 1,496.04 | 5.44% |
| 1986 | 1,577.45 | 5.44% |
| 1987 | 1,708.86 | 8.33% |
| 1988 | 1,850.86 | 8.31% |
| 1989 | 1,978.76 | 6.91% |
| 1990 | 2,123.97 | 7.34% |
| 1991 | 2,242.18 | 5.57% |
| 1992 | 2,561.78 | 14.25% |
| 1993 | 2,696.81 | 5.27% |
| 1994 | 2,922.13 | 8.36% |
| 1995 | 3,075.65 | 5.25% |
| 1996 | 3,197.86 | 3.97% |
| 1997 | 3,366.26 | 5.27% |
| 1998 | 3,468.67 | 3.04% |
| 1999 | 3,575.98 | 3.09% |
| 2000 | 3,800.39 | 6.28% |
| 2001 | 4,003.60 | 5.35% |
| 2002 | 4,264.80 | 6.52% |
| 2003 | 4,595.00 | 7.74% |
| 2004 | 5,010.30 | 9.04% |
| 2005 | 5,363.90 | 7.06% |
| 2006 | 5,862.70 | 9.30% |
| 2007 | 6,400.80 | 9.18% |
| 2008 | 6,611.50 | 3.29% |
| 2009 | 6,916.90 | 4.62% |
| 2010 | 7,630.70 | 10.32% |
| 2011 | 8,262.20 | 8.28% |
| 2012 | 8,585.10 | 3.91% |
| 2013 | 9,177.20 | 6.90% |
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