|
| year | consumption | change |
| 1980 | 12,994.45 | NA |
| 1981 | 12,004.62 | -7.62 % |
| 1982 | 11,591.07 | -3.44 % |
| 1983 | 11,283.30 | -2.66 % |
| 1984 | 11,244.21 | -0.35 % |
| 1985 | 11,154.98 | -0.79 % |
| 1986 | 11,400.69 | 2.20 % |
| 1987 | 11,612.94 | 1.86 % |
| 1988 | 11,811.83 | 1.71 % |
| 1989 | 11,966.79 | 1.31 % |
| 1990 | 12,021.76 | 0.46 % |
| 1991 | 14,557.54 | 21.09 % |
| 1992 | 20,590.70 | 41.44 % |
| 1993 | 19,742.64 | -4.12 % |
| 1994 | 19,139.50 | -3.06 % |
| 1995 | 19,243.96 | 0.55 % |
| 1996 | 19,084.00 | -0.83 % |
| 1997 | 19,138.18 | 0.28 % |
| 1998 | 19,343.13 | 1.07 % |
| 1999 | 19,142.58 | -1.04 % |
| 2000 | 19,032.38 | -0.58 % |
| 2001 | 19,255.79 | 1.17 % |
| 2002 | 19,256.38 | 0.00 % |
| 2003 | 19,436.65 | 0.94 % |
| 2004 | 19,658.10 | 1.14 % |
| 2005 | 19,882.42 | 1.14 % |
| 2006 | 19,948.94 | 0.33 % |
| 2007 | 19,669.51 | -1.40 % |
| 2008 | 19,727.97 | 0.30 % |
| 2009 | 18,974.01 | -3.82 % |
| 2010 | 18,936.52 | -0.20 % |
| 2011 | 18,506.84 | -2.27 % |
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