|
| year | consumption | change |
| 1980 | 408.00 | NA |
| 1981 | 455.00 | 11.52 % |
| 1982 | 479.00 | 5.27 % |
| 1983 | 470.00 | -1.88 % |
| 1984 | 470.00 | 0.00 % |
| 1985 | 465.00 | -1.06 % |
| 1986 | 469.95 | 1.06 % |
| 1987 | 493.35 | 4.98 % |
| 1988 | 523.85 | 6.18 % |
| 1989 | 583.00 | 11.29 % |
| 1990 | 651.06 | 11.67 % |
| 1991 | 694.62 | 6.69 % |
| 1992 | 706.92 | 1.77 % |
| 1993 | 764.90 | 8.20 % |
| 1994 | 777.52 | 1.65 % |
| 1995 | 807.31 | 3.83 % |
| 1996 | 858.50 | 6.34 % |
| 1997 | 942.27 | 9.76 % |
| 1998 | 905.60 | -3.89 % |
| 1999 | 963.73 | 6.42 % |
| 2000 | 1,036.70 | 7.57 % |
| 2001 | 1,077.01 | 3.89 % |
| 2002 | 1,125.65 | 4.52 % |
| 2003 | 1,142.67 | 1.51 % |
| 2004 | 1,232.57 | 7.87 % |
| 2005 | 1,279.15 | 3.78 % |
| 2006 | 1,256.49 | -1.77 % |
| 2007 | 1,226.94 | -2.35 % |
| 2008 | 1,229.27 | 0.19 % |
| 2009 | 1,300.89 | 5.83 % |
| 2010 | 1,384.36 | 6.42 % |
| 2011 | 1,119.00 | -19.17 % |
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