|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 7.55 | NA |
| 1987 | 8.40 | 11.23 % |
| 1988 | 10.56 | 25.77 % |
| 1989 | 13.97 | 32.22 % |
| 1990 | 9.25 | -33.75 % |
| 1991 | 9.49 | 2.60 % |
| 1992 | 7.36 | -22.46 % |
| 1993 | 6.86 | -6.87 % |
| 1994 | 4.07 | -40.65 % |
| 1995 | 7.15 | 75.78 % |
| 1996 | 3.64 | -49.17 % |
| 1997 | 7.33 | 101.51 % |
| 1998 | 10.29 | 40.48 % |
| 1999 | 12.31 | 19.62 % |
| 2000 | 11.07 | -10.07 % |
| 2001 | 4.93 | -55.49 % |
| 2002 | 9.53 | 93.40 % |
| 2003 | 9.21 | -3.34 % |
| 2004 | 11.86 | 28.76 % |
| 2005 | 11.43 | -3.61 % |
| 2006 | 13.15 | 15.04 % |
| 2007 | 10.60 | -19.40 % |
| 2008 | 15.26 | 43.91 % |
| 2009 | 17.38 | 13.91 % |
| 2010 | 14.46 | -16.82 % |
|
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