|
| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 16,534.67 | NA |
| 1993 | 14,330.05 | -13.33 % |
| 1994 | 1,543.24 | -89.23 % |
| 1995 | 1,807.79 | 17.14 % |
| 1996 | 1,862.91 | 3.05 % |
| 1997 | 6,010.90 | 222.66 % |
| 1998 | 7,754.76 | 29.01 % |
| 1999 | 7,464.85 | -3.74 % |
| 2000 | 8,197.89 | 9.82 % |
| 2001 | 8,074.43 | -1.51 % |
| 2002 | 8,633.30 | 6.92 % |
| 2003 | 9,273.75 | 7.42 % |
| 2004 | 9,359.73 | 0.93 % |
| 2005 | 9,947.26 | 6.28 % |
| 2006 | 10,835.72 | 8.93 % |
| 2007 | 10,604.24 | -2.14 % |
| 2008 | 12,222.43 | 15.26 % |
| 2009 | 12,362.42 | 1.15 % |
| 2010 | 12,715.16 | 2.85 % |
| 2011 | 13,713.86 | 7.85 % |
|
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