|
| year | consumption | change |
| 1980 | 10,575.58 | NA |
| 1981 | 10,928.31 | 3.34 % |
| 1982 | 11,940.24 | 9.26 % |
| 1983 | 12,873.89 | 7.82 % |
| 1984 | 15,416.93 | 19.75 % |
| 1985 | 18,643.39 | 20.93 % |
| 1986 | 18,798.82 | 0.83 % |
| 1987 | 19,315.80 | 2.75 % |
| 1988 | 19,204.47 | -0.58 % |
| 1989 | 19,306.98 | 0.53 % |
| 1990 | 16,968.98 | -12.11 % |
| 1991 | 19,582.56 | 15.40 % |
| 1992 | 18,756.93 | -4.22 % |
| 1993 | 18,982.90 | 1.20 % |
| 1994 | 19,680.67 | 3.68 % |
| 1995 | 20,771.96 | 5.54 % |
| 1996 | 21,344.05 | 2.75 % |
| 1997 | 21,771.75 | 2.00 % |
| 1998 | 21,163.28 | -2.79 % |
| 1999 | 22,818.95 | 7.82 % |
| 2000 | 24,145.03 | 5.81 % |
| 2001 | 23,725.05 | -1.74 % |
| 2002 | 22,091.42 | -6.89 % |
| 2003 | 22,354.88 | 1.19 % |
| 2004 | 24,183.92 | 8.18 % |
| 2005 | 23,757.57 | -1.76 % |
| 2006 | 23,616.47 | -0.59 % |
| 2007 | 24,658.04 | 4.41 % |
| 2008 | 24,610.20 | -0.19 % |
| 2009 | 19,470.57 | -20.88 % |
| 2010 | 25,823.16 | 32.63 % |
| 2011 | 27,569.97 | 6.76 % |
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