|
| year | consumption | change |
| 1980 | 248.26 | NA |
| 1981 | 247.91 | -0.14 % |
| 1982 | 235.55 | -4.99 % |
| 1983 | 316.07 | 34.18 % |
| 1984 | 369.04 | 16.76 % |
| 1985 | 436.49 | 18.28 % |
| 1986 | 470.75 | 7.85 % |
| 1987 | 486.99 | 3.45 % |
| 1988 | 517.01 | 6.16 % |
| 1989 | 578.81 | 11.95 % |
| 1990 | 629.67 | 8.79 % |
| 1991 | 764.92 | 21.48 % |
| 1992 | 796.71 | 4.16 % |
| 1993 | 849.68 | 6.65 % |
| 1994 | 965.15 | 13.59 % |
| 1995 | 1,061.22 | 9.95 % |
| 1996 | 1,136.79 | 7.12 % |
| 1997 | 1,125.49 | -0.99 % |
| 1998 | 982.82 | -12.68 % |
| 1999 | 1,124.43 | 14.41 % |
| 2000 | 957.74 | -14.82 % |
| 2001 | 725.72 | -24.23 % |
| 2002 | 797.06 | 9.83 % |
| 2003 | 805.18 | 1.02 % |
| 2004 | 675.22 | -16.14 % |
| 2005 | 719.01 | 6.49 % |
| 2006 | 992.35 | 38.02 % |
| 2007 | 1,126.55 | 13.52 % |
| 2008 | 1,194.71 | 6.05 % |
| 2009 | 1,344.44 | 12.53 % |
| 2010 | 1,397.06 | 3.91 % |
| 2011 | 1,327.14 | -5.01 % |
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