|
| year | consumption | change |
| 1980 | 8,740.11 | NA |
| 1981 | 8,697.20 | -0.49 % |
| 1982 | 8,889.73 | 2.21 % |
| 1983 | 9,034.90 | 1.63 % |
| 1984 | 9,573.18 | 5.96 % |
| 1985 | 9,906.47 | 3.48 % |
| 1986 | 10,201.43 | 2.98 % |
| 1987 | 10,427.36 | 2.21 % |
| 1988 | 10,206.71 | -2.12 % |
| 1989 | 10,668.78 | 4.53 % |
| 1990 | 10,503.50 | -1.55 % |
| 1991 | 13,316.18 | 26.78 % |
| 1992 | 34,210.05 | 156.91 % |
| 1993 | 34,934.41 | 2.12 % |
| 1994 | 33,394.18 | -4.41 % |
| 1995 | 33,469.02 | 0.22 % |
| 1996 | 33,207.56 | -0.78 % |
| 1997 | 32,084.67 | -3.38 % |
| 1998 | 32,479.28 | 1.23 % |
| 1999 | 33,201.04 | 2.22 % |
| 2000 | 34,230.48 | 3.10 % |
| 2001 | 34,452.64 | 0.65 % |
| 2002 | 35,471.91 | 2.96 % |
| 2003 | 37,429.91 | 5.52 % |
| 2004 | 38,422.75 | 2.65 % |
| 2005 | 38,773.86 | 0.91 % |
| 2006 | 39,041.51 | 0.69 % |
| 2007 | 39,362.56 | 0.82 % |
| 2008 | 40,058.79 | 1.77 % |
| 2009 | 35,414.30 | -11.59 % |
| 2010 | 38,417.00 | 8.48 % |
| 2011 | 40,240.35 | 4.75 % |
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