|
| year | consumption | change |
| 1980 | 8,995.00 | NA |
| 1981 | 8,935.00 | -0.67 % |
| 1982 | 9,075.00 | 1.57 % |
| 1983 | 8,950.00 | -1.38 % |
| 1984 | 8,910.00 | -0.45 % |
| 1985 | 8,950.00 | 0.45 % |
| 1986 | 8,975.40 | 0.28 % |
| 1987 | 8,994.97 | 0.22 % |
| 1988 | 8,890.44 | -1.16 % |
| 1989 | 8,740.00 | -1.69 % |
| 1990 | 8,392.00 | -3.98 % |
| 1991 | 8,350.00 | -0.50 % |
| 1992 | | NA |
| 1993 | | NA |
| 1994 | | NA |
| 1995 | | NA |
| 1996 | | NA |
| 1997 | | NA |
| 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 |
|
|