|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 49.00 | NA |
| 1987 | 50.49 | 3.04 % |
| 1988 | 52.42 | 3.83 % |
| 1989 | 50.53 | -3.60 % |
| 1990 | 49.41 | -2.22 % |
| 1991 | 49.92 | 1.03 % |
| 1992 | 41.71 | -16.44 % |
| 1993 | 35.16 | -15.72 % |
| 1994 | 30.01 | -14.64 % |
| 1995 | 24.69 | -17.73 % |
| 1996 | 32.63 | 32.16 % |
| 1997 | 25.35 | -22.31 % |
| 1998 | 23.59 | -6.93 % |
| 1999 | 22.07 | -6.46 % |
| 2000 | 21.12 | -4.29 % |
| 2001 | 21.11 | -0.03 % |
| 2002 | 20.71 | -1.91 % |
| 2003 | 14.89 | -28.12 % |
| 2004 | 10.71 | -28.08 % |
| 2005 | 6.52 | -39.08 % |
| 2006 | 3.54 | -45.78 % |
| 2007 | 3.03 | -14.37 % |
| 2008 | 2.82 | -6.99 % |
| 2009 | 3.20 | 13.53 % |
| 2010 | 3.20 | 0.00 % |
|
|
