|
| year | consumption | change |
| 1980 | 1,961.01 | NA |
| 1981 | 1,864.01 | -4.95 % |
| 1982 | 1,250.02 | -32.94 % |
| 1983 | 1,811.10 | 44.89 % |
| 1984 | 2,102.11 | 16.07 % |
| 1985 | 2,145.10 | 2.05 % |
| 1986 | 1,945.58 | -9.30 % |
| 1987 | 2,026.05 | 4.14 % |
| 1988 | 2,836.25 | 39.99 % |
| 1989 | 3,808.49 | 34.28 % |
| 1990 | 4,144.22 | 8.82 % |
| 1991 | 3,296.84 | -20.45 % |
| 1992 | 2,935.30 | -10.97 % |
| 1993 | 2,968.22 | 1.12 % |
| 1994 | 3,536.38 | 19.14 % |
| 1995 | 3,890.69 | 10.02 % |
| 1996 | 5,336.93 | 37.17 % |
| 1997 | 6,881.27 | 28.94 % |
| 1998 | 6,084.91 | -11.57 % |
| 1999 | 6,780.79 | 11.44 % |
| 2000 | 5,095.31 | -24.86 % |
| 2001 | 3,970.59 | -22.07 % |
| 2002 | 4,024.54 | 1.36 % |
| 2003 | 3,982.65 | -1.04 % |
| 2004 | 5,696.45 | 43.03 % |
| 2005 | 5,689.03 | -0.13 % |
| 2006 | 6,678.90 | 17.40 % |
| 2007 | 6,254.52 | -6.35 % |
| 2008 | 9,045.30 | 44.62 % |
| 2009 | 7,977.45 | -11.81 % |
| 2010 | 9,482.08 | 18.86 % |
| 2011 | 8,953.49 | -5.57 % |
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