|
| year | consumption | change |
| 1980 | 19,244.15 | NA |
| 1981 | 20,888.80 | 8.55 % |
| 1982 | 22,741.79 | 8.87 % |
| 1983 | 20,135.92 | -11.46 % |
| 1984 | 24,671.93 | 22.53 % |
| 1985 | 26,875.45 | 8.93 % |
| 1986 | 23,564.11 | -12.32 % |
| 1987 | 24,713.82 | 4.88 % |
| 1988 | 23,366.80 | -5.45 % |
| 1989 | 23,089.01 | -1.19 % |
| 1990 | 24,772.24 | 7.29 % |
| 1991 | 23,181.61 | -6.42 % |
| 1992 | 20,369.61 | -12.13 % |
| 1993 | 17,725.17 | -12.98 % |
| 1994 | 18,711.73 | 5.57 % |
| 1995 | 19,966.17 | 6.70 % |
| 1996 | 18,319.31 | -8.25 % |
| 1997 | 18,433.95 | 0.63 % |
| 1998 | 19,261.79 | 4.49 % |
| 1999 | 19,209.98 | -0.27 % |
| 2000 | 20,480.95 | 6.62 % |
| 2001 | 21,904.03 | 6.95 % |
| 2002 | 22,747.30 | 3.85 % |
| 2003 | 24,754.61 | 8.82 % |
| 2004 | 27,794.78 | 12.28 % |
| 2005 | 27,497.16 | -1.07 % |
| 2006 | 27,796.99 | 1.09 % |
| 2007 | 27,974.46 | 0.64 % |
| 2008 | 27,203.94 | -2.75 % |
| 2009 | 21,057.45 | -22.59 % |
| 2010 | 23,370.10 | 10.98 % |
| 2011 | 25,264.98 | 8.11 % |
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