|
| year | consumption | change |
| 1980 | 2,633.50 | NA |
| 1981 | 2,591.77 | -1.58 % |
| 1982 | 2,539.50 | -2.02 % |
| 1983 | 2,406.78 | -5.23 % |
| 1984 | 2,438.90 | 1.33 % |
| 1985 | 2,434.97 | -0.16 % |
| 1986 | 2,665.95 | 9.49 % |
| 1987 | 2,746.73 | 3.03 % |
| 1988 | 2,812.63 | 2.40 % |
| 1989 | 2,783.55 | -1.03 % |
| 1990 | 2,927.31 | 5.16 % |
| 1991 | 2,977.41 | 1.71 % |
| 1992 | 3,106.93 | 4.35 % |
| 1993 | 3,233.65 | 4.08 % |
| 1994 | 3,371.31 | 4.26 % |
| 1995 | 3,528.08 | 4.65 % |
| 1996 | 3,730.14 | 5.73 % |
| 1997 | 3,902.47 | 4.62 % |
| 1998 | 4,018.28 | 2.97 % |
| 1999 | 4,087.07 | 1.71 % |
| 2000 | 4,125.40 | 0.94 % |
| 2001 | 4,156.84 | 0.76 % |
| 2002 | 4,073.76 | -2.00 % |
| 2003 | 3,999.25 | -1.83 % |
| 2004 | 4,135.55 | 3.41 % |
| 2005 | 4,280.04 | 3.49 % |
| 2006 | 4,511.44 | 5.41 % |
| 2007 | 4,773.23 | 5.80 % |
| 2008 | 4,864.02 | 1.90 % |
| 2009 | 4,934.63 | 1.45 % |
| 2010 | 5,140.89 | 4.18 % |
| 2011 | 5,606.72 | 9.06 % |
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