|
| year | consumption | change |
| 1980 | 1,601.66 | NA |
| 1981 | 1,490.33 | -6.95 % |
| 1982 | 1,498.04 | 0.52 % |
| 1983 | 1,499.14 | 0.07 % |
| 1984 | 1,822.12 | 21.54 % |
| 1985 | 1,857.40 | 1.94 % |
| 1986 | 1,651.26 | -11.10 % |
| 1987 | 1,570.79 | -4.87 % |
| 1988 | 1,611.58 | 2.60 % |
| 1989 | 1,586.23 | -1.57 % |
| 1990 | 1,408.75 | -11.19 % |
| 1991 | 1,280.89 | -9.08 % |
| 1992 | 1,254.43 | -2.07 % |
| 1993 | 1,388.91 | 10.72 % |
| 1994 | 1,612.68 | 16.11 % |
| 1995 | 1,673.31 | 3.76 % |
| 1996 | 1,641.34 | -1.91 % |
| 1997 | 1,682.13 | 2.48 % |
| 1998 | 1,750.47 | 4.06 % |
| 1999 | 1,736.14 | -0.82 % |
| 2000 | 1,757.08 | 1.21 % |
| 2001 | 1,543.24 | -12.17 % |
| 2002 | 1,329.39 | -13.86 % |
| 2003 | 1,289.70 | -2.99 % |
| 2004 | 1,515.68 | 17.52 % |
| 2005 | 1,268.76 | -16.29 % |
| 2006 | 1,165.14 | -8.17 % |
| 2007 | 1,315.06 | 12.87 % |
| 2008 | 1,404.35 | 6.79 % |
| 2009 | 917.12 | -34.69 % |
| 2010 | 1,370.17 | 49.40 % |
| 2011 | 1,363.56 | -0.48 % |
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