|
| year | consumption | change |
| 1980 | 30.50 | NA |
| 1981 | 140.05 | 359.21 % |
| 1982 | 1,832.11 | 1,208.15 % |
| 1983 | 3,936.72 | 114.87 % |
| 1984 | 4,885.07 | 24.09 % |
| 1985 | 6,278.80 | 28.53 % |
| 1986 | 6,889.87 | 9.73 % |
| 1987 | 8,863.92 | 28.65 % |
| 1988 | 10,780.45 | 21.62 % |
| 1989 | 11,612.57 | 7.72 % |
| 1990 | 10,378.34 | -10.63 % |
| 1991 | 9,274.81 | -10.63 % |
| 1992 | 11,547.80 | 24.51 % |
| 1993 | 13,329.60 | 15.43 % |
| 1994 | 9,604.18 | -27.95 % |
| 1995 | 10,328.56 | 7.54 % |
| 1996 | 8,237.93 | -20.24 % |
| 1997 | 7,068.76 | -14.19 % |
| 1998 | 8,601.89 | 21.69 % |
| 1999 | 7,046.58 | -18.08 % |
| 2000 | 6,678.34 | -5.23 % |
| 2001 | 8,854.82 | 32.59 % |
| 2002 | 9,606.76 | 8.49 % |
| 2003 | 11,754.57 | 22.36 % |
| 2004 | 11,785.32 | 0.26 % |
| 2005 | 11,932.58 | 1.25 % |
| 2006 | 12,562.56 | 5.28 % |
| 2007 | 13,515.92 | 7.59 % |
| 2008 | 12,505.86 | -7.47 % |
| 2009 | 13,593.45 | 8.70 % |
| 2010 | 11,381.35 | -16.27 % |
| 2011 | 13,810.72 | 21.35 % |
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