|
| year | consumption | change |
| 1980 | 3,185.68 | NA |
| 1981 | 2,988.37 | -6.19 % |
| 1982 | 2,927.74 | -2.03 % |
| 1983 | 3,452.44 | 17.92 % |
| 1984 | 3,220.95 | -6.70 % |
| 1985 | 3,344.41 | 3.83 % |
| 1986 | 4,515.07 | 35.00 % |
| 1987 | 5,390.30 | 19.38 % |
| 1988 | 5,563.37 | 3.21 % |
| 1989 | 5,088.27 | -8.54 % |
| 1990 | 5,447.62 | 7.06 % |
| 1991 | 5,862.09 | 7.61 % |
| 1992 | 6,095.78 | 3.99 % |
| 1993 | 5,657.06 | -7.20 % |
| 1994 | 5,276.77 | -6.72 % |
| 1995 | 4,984.65 | -5.54 % |
| 1996 | 4,746.55 | -4.78 % |
| 1997 | 4,292.40 | -9.57 % |
| 1998 | 4,256.03 | -0.85 % |
| 1999 | 4,893.16 | 14.97 % |
| 2000 | 4,489.71 | -8.25 % |
| 2001 | 4,362.95 | -2.82 % |
| 2002 | 4,161.23 | -4.62 % |
| 2003 | 3,707.07 | -10.91 % |
| 2004 | 3,558.26 | -4.01 % |
| 2005 | 3,791.95 | 6.57 % |
| 2006 | 3,600.15 | -5.06 % |
| 2007 | 3,632.12 | 0.89 % |
| 2008 | 2,812.00 | -22.58 % |
| 2009 | 2,978.45 | 5.92 % |
| 2010 | 3,227.57 | 8.36 % |
| 2011 | 3,131.67 | -2.97 % |
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