|
| year | consumption | change |
| 1980 | 203.93 | NA |
| 1981 | 238.10 | 16.76 % |
| 1982 | 238.10 | 0.00 % |
| 1983 | 440.92 | 85.19 % |
| 1984 | 385.81 | -12.50 % |
| 1985 | 615.09 | 59.43 % |
| 1986 | 507.06 | -17.56 % |
| 1987 | 842.17 | 66.09 % |
| 1988 | 765.00 | -9.16 % |
| 1989 | 663.59 | -13.26 % |
| 1990 | 682.42 | 2.84 % |
| 1991 | 781.31 | 14.49 % |
| 1992 | 827.40 | 5.90 % |
| 1993 | 890.12 | 7.58 % |
| 1994 | 754.86 | -15.20 % |
| 1995 | 774.32 | 2.58 % |
| 1996 | 840.66 | 8.57 % |
| 1997 | 750.26 | -10.75 % |
| 1998 | 805.22 | 7.33 % |
| 1999 | 980.25 | 21.74 % |
| 2000 | 1,115.23 | 13.77 % |
| 2001 | 908.57 | -18.53 % |
| 2002 | 1,592.44 | 75.27 % |
| 2003 | 3,523.14 | 121.24 % |
| 2004 | 3,232.90 | -8.24 % |
| 2005 | 2,861.62 | -11.48 % |
| 2006 | 3,667.81 | 28.17 % |
| 2007 | 3,748.50 | 2.20 % |
| 2008 | 3,628.60 | -3.20 % |
| 2009 | 3,454.28 | -4.80 % |
| 2010 | 3,673.93 | 6.36 % |
| 2011 | 3,878.53 | 5.57 % |
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