|
| year | consumption | change |
| 1980 | 609.47 | NA |
| 1981 | 662.62 | 8.72 % |
| 1982 | 722.83 | 9.09 % |
| 1983 | 813.16 | 12.50 % |
| 1984 | 914.73 | 12.49 % |
| 1985 | 1,033.01 | 12.93 % |
| 1986 | 1,143.90 | 10.73 % |
| 1987 | 1,170.18 | 2.30 % |
| 1988 | 1,236.54 | 5.67 % |
| 1989 | 1,316.88 | 6.50 % |
| 1990 | 1,423.67 | 8.11 % |
| 1991 | 1,530.92 | 7.53 % |
| 1992 | 1,597.55 | 4.35 % |
| 1993 | 1,657.83 | 3.77 % |
| 1994 | 1,803.00 | 8.76 % |
| 1995 | 1,940.46 | 7.62 % |
| 1996 | 2,046.89 | 5.49 % |
| 1997 | 2,046.15 | -0.04 % |
| 1998 | 1,913.33 | -6.49 % |
| 1999 | 2,087.72 | 9.11 % |
| 2000 | 1,970.93 | -5.59 % |
| 2001 | 1,798.56 | -8.75 % |
| 2002 | 1,900.94 | 5.69 % |
| 2003 | 1,891.65 | -0.49 % |
| 2004 | 1,812.47 | -4.19 % |
| 2005 | 1,871.10 | 3.23 % |
| 2006 | 2,177.03 | 16.35 % |
| 2007 | 2,315.25 | 6.35 % |
| 2008 | 2,373.84 | 2.53 % |
| 2009 | 2,598.02 | 9.44 % |
| 2010 | 2,740.44 | 5.48 % |
| 2011 | 2,722.86 | -0.64 % |
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