|
| year | consumption | change |
| 1980 | 22,558.69 | NA |
| 1981 | 22,111.53 | -1.98 % |
| 1982 | 20,802.96 | -5.92 % |
| 1983 | 19,643.11 | -5.58 % |
| 1984 | 20,913.96 | 6.47 % |
| 1985 | 20,436.43 | -2.28 % |
| 1986 | 19,231.04 | -5.90 % |
| 1987 | 20,215.82 | 5.12 % |
| 1988 | 21,264.78 | 5.19 % |
| 1989 | 22,426.57 | 5.46 % |
| 1990 | 22,469.62 | 0.19 % |
| 1991 | 22,911.48 | 1.97 % |
| 1992 | 23,782.53 | 3.80 % |
| 1993 | 24,457.25 | 2.84 % |
| 1994 | 25,010.81 | 2.26 % |
| 1995 | 26,122.12 | 4.44 % |
| 1996 | 26,628.87 | 1.94 % |
| 1997 | 26,802.46 | 0.65 % |
| 1998 | 26,327.21 | -1.77 % |
| 1999 | 26,774.74 | 1.70 % |
| 2000 | 27,722.55 | 3.54 % |
| 2001 | 26,755.75 | -3.49 % |
| 2002 | 27,693.41 | 3.50 % |
| 2003 | 27,289.65 | -1.46 % |
| 2004 | 27,397.28 | 0.39 % |
| 2005 | 27,074.18 | -1.18 % |
| 2006 | 27,205.63 | 0.49 % |
| 2007 | 28,244.06 | 3.82 % |
| 2008 | 28,416.89 | 0.61 % |
| 2009 | 28,107.63 | -1.09 % |
| 2010 | 29,286.11 | 4.19 % |
| 2011 | 29,912.82 | 2.14 % |
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