|
| year | consumption | change |
| 1980 | 2.20 | NA |
| 1981 | 2.20 | 0.00 % |
| 1982 | 2.20 | 0.00 % |
| 1983 | 2.20 | 0.00 % |
| 1984 | 2.20 | 0.00 % |
| 1985 | 2.20 | 0.00 % |
| 1986 | 2.20 | 0.00 % |
| 1987 | 3.31 | 50.00 % |
| 1988 | 3.31 | 0.00 % |
| 1989 | 3.31 | 0.00 % |
| 1990 | 3.31 | 0.00 % |
| 1991 | 3.31 | 0.00 % |
| 1992 | 3.31 | 0.00 % |
| 1993 | 3.31 | 0.00 % |
| 1994 | 3.31 | 0.00 % |
| 1995 | 3.31 | 0.00 % |
| 1996 | 3.31 | 0.00 % |
| 1997 | 3.31 | 0.00 % |
| 1998 | | NA |
| 1999 | | NA |
| 2000 | | NA |
| 2001 | | NA |
| 2002 | | NA |
| 2003 | | NA |
| 2004 | | NA |
| 2005 | | NA |
| 2006 | | NA |
| 2007 | | NA |
| 2008 | | NA |
| 2009 | | NA |
| 2010 | | NA |
| 2011 | | NA |
|
|