|
| year | consumption | change |
| 1980 | 20,206.54 | NA |
| 1981 | 19,231.81 | -4.82 % |
| 1982 | 18,357.84 | -4.54 % |
| 1983 | 18,035.12 | -1.76 % |
| 1984 | 18,635.02 | 3.33 % |
| 1985 | 18,724.26 | 0.48 % |
| 1986 | 19,328.27 | 3.23 % |
| 1987 | 19,840.75 | 2.65 % |
| 1988 | 20,557.59 | 3.61 % |
| 1989 | 20,790.27 | 1.13 % |
| 1990 | 20,319.32 | -2.27 % |
| 1991 | 20,128.03 | -0.94 % |
| 1992 | 20,518.80 | 1.94 % |
| 1993 | 20,799.54 | 1.37 % |
| 1994 | 21,404.04 | 2.91 % |
| 1995 | 21,332.17 | -0.34 % |
| 1996 | 21,989.58 | 3.08 % |
| 1997 | 22,455.89 | 2.12 % |
| 1998 | 22,857.85 | 1.79 % |
| 1999 | 23,586.04 | 3.19 % |
| 2000 | 23,818.72 | 0.99 % |
| 2001 | 23,768.44 | -0.21 % |
| 2002 | 23,853.45 | 0.36 % |
| 2003 | 24,248.20 | 1.65 % |
| 2004 | 25,090.98 | 3.48 % |
| 2005 | 25,242.81 | 0.61 % |
| 2006 | 25,048.28 | -0.77 % |
| 2007 | 25,145.82 | 0.39 % |
| 2008 | 23,899.62 | -4.96 % |
| 2009 | 23,004.24 | -3.75 % |
| 2010 | 23,527.40 | 2.27 % |
| 2011 | 23,371.46 | -0.66 % |
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