|
| year | consumption | change |
| 1980 | 5,513.44 | NA |
| 1981 | 4,782.93 | -13.25 % |
| 1982 | 5,712.67 | 19.44 % |
| 1983 | 5,926.20 | 3.74 % |
| 1984 | 6,024.13 | 1.65 % |
| 1985 | 6,794.65 | 12.79 % |
| 1986 | 7,519.97 | 10.67 % |
| 1987 | 7,944.36 | 5.64 % |
| 1988 | 8,311.43 | 4.62 % |
| 1989 | 7,911.29 | -4.81 % |
| 1990 | 7,335.88 | -7.27 % |
| 1991 | 7,806.57 | 6.42 % |
| 1992 | 6,982.04 | -10.56 % |
| 1993 | 6,386.79 | -8.53 % |
| 1994 | 5,844.46 | -8.49 % |
| 1995 | 5,751.86 | -1.58 % |
| 1996 | 5,797.06 | 0.79 % |
| 1997 | 5,546.83 | -4.32 % |
| 1998 | 5,595.33 | 0.87 % |
| 1999 | 5,530.30 | -1.16 % |
| 2000 | 5,744.15 | 3.87 % |
| 2001 | 5,719.89 | -0.42 % |
| 2002 | 6,100.19 | 6.65 % |
| 2003 | 5,776.11 | -5.31 % |
| 2004 | 5,824.61 | 0.84 % |
| 2005 | 6,032.95 | 3.58 % |
| 2006 | 6,524.58 | 8.15 % |
| 2007 | 6,682.21 | 2.42 % |
| 2008 | 6,613.87 | -1.02 % |
| 2009 | 7,188.17 | 8.68 % |
| 2010 | 7,177.15 | -0.15 % |
| 2011 | 10,144.57 | 41.35 % |
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