|
| year | consumption | change |
| 1980 | 253.04 | NA |
| 1981 | 263.65 | 4.19 % |
| 1982 | 286.96 | 8.84 % |
| 1983 | 249.23 | -13.15 % |
| 1984 | 232.62 | -6.67 % |
| 1985 | 310.55 | 33.50 % |
| 1986 | 290.46 | -6.47 % |
| 1987 | 324.02 | 11.56 % |
| 1988 | 382.28 | 17.98 % |
| 1989 | 333.20 | -12.84 % |
| 1990 | 256.81 | -22.93 % |
| 1991 | 438.47 | 70.74 % |
| 1992 | 425.88 | -2.87 % |
| 1993 | 605.12 | 42.09 % |
| 1994 | 551.49 | -8.86 % |
| 1995 | 580.84 | 5.32 % |
| 1996 | 606.98 | 4.50 % |
| 1997 | 633.96 | 4.45 % |
| 1998 | 691.53 | 9.08 % |
| 1999 | 631.54 | -8.67 % |
| 2000 | 980.91 | 55.32 % |
| 2001 | 893.34 | -8.93 % |
| 2002 | 1,208.62 | 35.29 % |
| 2003 | 1,193.70 | -1.23 % |
| 2004 | 1,219.41 | 2.15 % |
| 2005 | 1,594.60 | 30.77 % |
| 2006 | 1,224.84 | -23.19 % |
| 2007 | 1,608.72 | 31.34 % |
| 2008 | 1,440.12 | -10.48 % |
| 2009 | 1,073.75 | -25.44 % |
| 2010 | 1,175.27 | 9.45 % |
| 2011 | 1,141.94 | -2.84 % |
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