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| year | consumption | change |
| 1980 | 6,891.14 | NA |
| 1981 | 6,981.29 | 1.31% |
| 1982 | 7,141.55 | 2.30% |
| 1983 | 7,433.21 | 4.08% |
| 1984 | 7,906.19 | 6.36% |
| 1985 | 8,191.29 | 3.61% |
| 1986 | 8,407.56 | 2.64% |
| 1987 | 8,787.65 | 4.52% |
| 1988 | 9,194.62 | 4.63% |
| 1989 | 9,650.37 | 4.96% |
| 1990 | 9,905.77 | 2.65% |
| 1991 | 10,516.43 | 6.16% |
| 1992 | 10,589.78 | 0.70% |
| 1993 | 10,868.13 | 2.63% |
| 1994 | 11,118.69 | 2.31% |
| 1995 | 11,480.47 | 3.25% |
| 1996 | 11,813.73 | 2.90% |
| 1997 | 12,129.29 | 2.67% |
| 1998 | 12,430.47 | 2.48% |
| 1999 | 12,694.51 | 2.12% |
| 2000 | 13,232.94 | 4.24% |
| 2001 | 13,490.92 | 1.95% |
| 2002 | 13,940.99 | 3.34% |
| 2003 | 14,460.05 | 3.72% |
| 2004 | 15,118.67 | 4.55% |
| 2005 | 15,694.22 | 3.81% |
| 2006 | 16,376.92 | 4.35% |
| 2007 | 17,160.54 | 4.78% |
| 2008 | 17,410.61 | 1.46% |
| 2009 | 17,343.92 | -0.38% |
| 2010 | 18,542.40 | 6.91% |
| 2011 | 19,286.42 | 4.01% |
| 2012 | 19,616.62 | 1.71% |
| 2013 | 20,244.02 | 3.20% |
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