|
| year | consumption | change |
| 1980 | 8,014.91 | NA |
| 1981 | 6,947.87 | -13.31 % |
| 1982 | 4,555.85 | -34.43 % |
| 1983 | 4,735.53 | 3.94 % |
| 1984 | 5,434.40 | 14.76 % |
| 1985 | 7,082.35 | 30.32 % |
| 1986 | 6,232.47 | -12.00 % |
| 1987 | 7,504.54 | 20.41 % |
| 1988 | 7,276.36 | -3.04 % |
| 1989 | 7,193.68 | -1.14 % |
| 1990 | 7,091.17 | -1.43 % |
| 1991 | 6,982.26 | -1.54 % |
| 1992 | 6,077.04 | -12.96 % |
| 1993 | 7,195.89 | 18.41 % |
| 1994 | 8,983.84 | 24.85 % |
| 1995 | 7,508.95 | -16.42 % |
| 1996 | 8,812.54 | 17.36 % |
| 1997 | 8,203.40 | -6.91 % |
| 1998 | 6,219.24 | -24.19 % |
| 1999 | 6,224.75 | 0.09 % |
| 2000 | 6,311.84 | 1.40 % |
| 2001 | 7,263.13 | 15.07 % |
| 2002 | 7,805.47 | 7.47 % |
| 2003 | 10,352.91 | 32.64 % |
| 2004 | 9,468.85 | -8.54 % |
| 2005 | 5,643.83 | -40.40 % |
| 2006 | 8,995.96 | 59.39 % |
| 2007 | 8,402.92 | -6.59 % |
| 2008 | 6,045.08 | -28.06 % |
| 2009 | 6,293.10 | 4.10 % |
| 2010 | 8,184.66 | 30.06 % |
| 2011 | 6,467.26 | -20.98 % |
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