|
| year | consumption | change |
| 1980 | 408.96 | NA |
| 1981 | 443.13 | 8.36 % |
| 1982 | 478.40 | 7.96 % |
| 1983 | 460.77 | -3.69 % |
| 1984 | 462.97 | 0.48 % |
| 1985 | 513.74 | 10.97 % |
| 1986 | 585.74 | 14.02 % |
| 1987 | 688.29 | 17.51 % |
| 1988 | 698.73 | 1.52 % |
| 1989 | 748.52 | 7.13 % |
| 1990 | 901.74 | 20.47 % |
| 1991 | 883.91 | -1.98 % |
| 1992 | 1,003.60 | 13.54 % |
| 1993 | 992.08 | -1.15 % |
| 1994 | 1,004.53 | 1.26 % |
| 1995 | 1,005.73 | 0.12 % |
| 1996 | 857.86 | -14.70 % |
| 1997 | 878.45 | 2.40 % |
| 1998 | 1,125.57 | 28.13 % |
| 1999 | 1,144.20 | 1.66 % |
| 2000 | 1,146.40 | 0.19 % |
| 2001 | 1,051.61 | -8.27 % |
| 2002 | 1,078.06 | 2.52 % |
| 2003 | 935.86 | -13.19 % |
| 2004 | 1,027.35 | 9.78 % |
| 2005 | 1,104.52 | 7.51 % |
| 2006 | 1,079.16 | -2.30 % |
| 2007 | 929.25 | -13.89 % |
| 2008 | 1,007.51 | 8.42 % |
| 2009 | 817.92 | -18.82 % |
| 2010 | 1,092.39 | 33.56 % |
| 2011 | 813.51 | -25.53 % |
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