|
| 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 | 27.03 | NA |
| 1993 | 15.54 | -42.49 % |
| 1994 | 7.48 | -51.88 % |
| 1995 | 8.00 | 6.98 % |
| 1996 | 14.49 | 81.08 % |
| 1997 | 15.62 | 7.78 % |
| 1998 | 15.82 | 1.28 % |
| 1999 | 17.42 | 10.14 % |
| 2000 | 15.84 | -9.07 % |
| 2001 | 12.67 | -20.03 % |
| 2002 | 12.29 | -2.96 % |
| 2003 | 12.44 | 1.20 % |
| 2004 | 12.97 | 4.22 % |
| 2005 | 15.04 | 16.00 % |
| 2006 | 16.14 | 7.34 % |
| 2007 | 18.06 | 11.87 % |
| 2008 | 18.86 | 4.45 % |
| 2009 | 19.89 | 5.44 % |
| 2010 | 21.11 | 6.15 % |
| 2011 | 13.00 | -38.42 % |
|
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