|
| year | consumption | change |
| 1980 | 4,960.00 | NA |
| 1981 | 4,848.00 | -2.26 % |
| 1982 | 4,582.00 | -5.49 % |
| 1983 | 4,395.02 | -4.08 % |
| 1984 | 4,666.00 | 6.17 % |
| 1985 | 4,436.00 | -4.93 % |
| 1986 | 4,503.00 | 1.51 % |
| 1987 | 4,567.00 | 1.42 % |
| 1988 | 4,849.00 | 6.17 % |
| 1989 | 5,058.00 | 4.31 % |
| 1990 | 5,315.00 | 5.08 % |
| 1991 | 5,389.00 | 1.39 % |
| 1992 | 5,478.00 | 1.65 % |
| 1993 | 5,395.00 | -1.52 % |
| 1994 | 5,655.00 | 4.82 % |
| 1995 | 5,693.00 | 0.67 % |
| 1996 | 5,739.00 | 0.81 % |
| 1997 | 5,702.00 | -0.64 % |
| 1998 | 5,507.00 | -3.42 % |
| 1999 | 5,642.00 | 2.45 % |
| 2000 | 5,515.43 | -2.24 % |
| 2001 | 5,411.95 | -1.88 % |
| 2002 | 5,318.76 | -1.72 % |
| 2003 | 5,428.41 | 2.06 % |
| 2004 | 5,318.77 | -2.02 % |
| 2005 | 5,327.95 | 0.17 % |
| 2006 | 5,197.40 | -2.45 % |
| 2007 | 5,037.04 | -3.09 % |
| 2008 | 4,788.42 | -4.94 % |
| 2009 | 4,405.78 | -7.99 % |
| 2010 | 4,464.73 | 1.34 % |
| 2011 | 4,480.50 | 0.35 % |
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