|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 7.35 | NA |
| 1987 | 8.23 | 12.00 % |
| 1988 | 5.01 | -39.16 % |
| 1989 | 5.29 | 5.57 % |
| 1990 | 7.98 | 50.95 % |
| 1991 | 5.70 | -28.58 % |
| 1992 | 3.69 | -35.31 % |
| 1993 | 4.21 | 14.22 % |
| 1994 | 7.05 | 67.47 % |
| 1995 | 10.60 | 50.31 % |
| 1996 | 10.54 | -0.53 % |
| 1997 | 9.90 | -6.14 % |
| 1998 | 13.78 | 39.29 % |
| 1999 | 11.36 | -17.57 % |
| 2000 | 5.55 | -51.15 % |
| 2001 | 4.01 | -27.67 % |
| 2002 | 3.74 | -6.82 % |
| 2003 | 7.66 | 104.88 % |
| 2004 | 7.46 | -2.65 % |
| 2005 | 11.04 | 47.97 % |
| 2006 | 8.21 | -25.62 % |
| 2007 | 8.21 | 0.00 % |
| 2008 | 8.21 | 0.00 % |
| 2009 | 8.76 | 6.67 % |
| 2010 | 8.76 | 0.00 % |
|
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