|
| year | consumption | change |
| 1980 | 10,739.82 | NA |
| 1981 | 9,236.27 | -14.00 % |
| 1982 | 10,646.12 | 15.26 % |
| 1983 | 9,595.62 | -9.87 % |
| 1984 | 10,262.52 | 6.95 % |
| 1985 | 13,500.01 | 31.55 % |
| 1986 | 12,973.10 | -3.90 % |
| 1987 | 13,409.62 | 3.36 % |
| 1988 | 12,505.72 | -6.74 % |
| 1989 | 9,957.18 | -20.38 % |
| 1990 | 11,074.92 | 11.23 % |
| 1991 | 14,948.44 | 34.98 % |
| 1992 | 12,216.92 | -18.27 % |
| 1993 | 13,063.49 | 6.93 % |
| 1994 | 14,343.28 | 9.80 % |
| 1995 | 12,175.03 | -15.12 % |
| 1996 | 16,590.89 | 36.27 % |
| 1997 | 12,323.84 | -25.72 % |
| 1998 | 10,411.33 | -15.52 % |
| 1999 | 8,510.95 | -18.25 % |
| 2000 | 7,364.54 | -13.47 % |
| 2001 | 7,748.15 | 5.21 % |
| 2002 | 7,651.14 | -1.25 % |
| 2003 | 10,541.40 | 37.78 % |
| 2004 | 8,126.24 | -22.91 % |
| 2005 | 6,974.32 | -14.18 % |
| 2006 | 10,148.98 | 45.52 % |
| 2007 | 8,751.25 | -13.77 % |
| 2008 | 7,573.98 | -13.45 % |
| 2009 | 7,500.13 | -0.98 % |
| 2010 | 7,185.97 | -4.19 % |
| 2011 | 6,113.42 | -14.93 % |
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