|
| year | consumption | change |
| 1980 | 25.00 | NA |
| 1981 | 35.00 | 40.00 % |
| 1982 | 27.00 | -22.86 % |
| 1983 | 26.00 | -3.70 % |
| 1984 | | NA |
| 1985 | 4.56 | NA |
| 1986 | 7.82 | 71.43 % |
| 1987 | 5.32 | -31.97 % |
| 1988 | 5.54 | 4.09 % |
| 1989 | 5.44 | -1.75 % |
| 1990 | 12.55 | 130.60 % |
| 1991 | 14.25 | 13.51 % |
| 1992 | 17.06 | 19.74 % |
| 1993 | 22.69 | 32.98 % |
| 1994 | 32.07 | 41.33 % |
| 1995 | 24.31 | -24.19 % |
| 1996 | 21.61 | -11.10 % |
| 1997 | 24.70 | 14.26 % |
| 1998 | 20.16 | -18.36 % |
| 1999 | 22.33 | 10.73 % |
| 2000 | 18.58 | -16.78 % |
| 2001 | 20.21 | 8.77 % |
| 2002 | 13.66 | -32.42 % |
| 2003 | 15.40 | 12.73 % |
| 2004 | 12.13 | -21.25 % |
| 2005 | 13.53 | 11.55 % |
| 2006 | 14.23 | 5.19 % |
| 2007 | 12.71 | -10.65 % |
| 2008 | 11.00 | -13.47 % |
| 2009 | 6.82 | -38.01 % |
| 2010 | 6.58 | -3.52 % |
| 2011 | | NA |
|
|