|
| year | consumption | change |
| 1980 | 972.01 | NA |
| 1981 | 942.49 | -3.04 % |
| 1982 | 944.36 | 0.20 % |
| 1983 | 967.21 | 2.42 % |
| 1984 | 1,134.85 | 17.33 % |
| 1985 | 1,150.99 | 1.42 % |
| 1986 | 1,216.67 | 5.71 % |
| 1987 | 1,345.93 | 10.62 % |
| 1988 | 1,460.28 | 8.50 % |
| 1989 | 1,581.23 | 8.28 % |
| 1990 | 1,674.00 | 5.87 % |
| 1991 | 1,775.00 | 6.03 % |
| 1992 | 1,760.31 | -0.83 % |
| 1993 | 1,800.99 | 2.31 % |
| 1994 | 1,748.13 | -2.94 % |
| 1995 | 1,920.61 | 9.87 % |
| 1996 | 1,984.14 | 3.31 % |
| 1997 | 2,047.56 | 3.20 % |
| 1998 | 2,204.54 | 7.67 % |
| 1999 | 2,396.09 | 8.69 % |
| 2000 | 2,498.36 | 4.27 % |
| 2001 | 2,505.21 | 0.27 % |
| 2002 | 2,488.22 | -0.68 % |
| 2003 | 2,743.30 | 10.25 % |
| 2004 | 2,846.71 | 3.77 % |
| 2005 | 3,046.45 | 7.02 % |
| 2006 | 2,983.52 | -2.07 % |
| 2007 | 2,998.14 | 0.49 % |
| 2008 | 2,997.64 | -0.02 % |
| 2009 | 2,755.42 | -8.08 % |
| 2010 | 2,934.57 | 6.50 % |
| 2011 | 2,751.64 | -6.23 % |
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