|
| year | consumption | change |
| 1980 | 5.51 | NA |
| 1981 | 399.04 | 7,140.00 % |
| 1982 | 1,000.90 | 150.83 % |
| 1983 | 1,857.40 | 85.57 % |
| 1984 | 2,958.60 | 59.29 % |
| 1985 | 3,233.08 | 9.28 % |
| 1986 | 3,547.24 | 9.72 % |
| 1987 | 3,600.15 | 1.49 % |
| 1988 | 3,589.13 | -0.31 % |
| 1989 | 3,826.12 | 6.60 % |
| 1990 | 4,101.70 | 7.20 % |
| 1991 | 4,476.49 | 9.14 % |
| 1992 | 5,517.07 | 23.25 % |
| 1993 | 6,235.78 | 13.03 % |
| 1994 | 6,613.87 | 6.06 % |
| 1995 | 7,241.08 | 9.48 % |
| 1996 | 8,641.02 | 19.33 % |
| 1997 | 9,525.07 | 10.23 % |
| 1998 | 10,249.29 | 7.60 % |
| 1999 | 10,003.59 | -2.40 % |
| 2000 | 11,674.25 | 16.70 % |
| 2001 | 12,661.70 | 8.46 % |
| 2002 | 13,743.51 | 8.54 % |
| 2003 | 13,961.10 | 1.58 % |
| 2004 | 14,028.68 | 0.48 % |
| 2005 | 13,364.42 | -4.73 % |
| 2006 | 14,320.57 | 7.15 % |
| 2007 | 14,654.13 | 2.33 % |
| 2008 | 14,263.91 | -2.66 % |
| 2009 | 13,059.08 | -8.45 % |
| 2010 | 13,569.45 | 3.91 % |
| 2011 | 13,908.96 | 2.50 % |
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