|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.39 | NA |
| 1987 | 3.77 | 57.51 % |
| 1988 | 3.73 | -1.06 % |
| 1989 | 4.13 | 10.74 % |
| 1990 | 4.54 | 9.89 % |
| 1991 | 5.64 | 24.25 % |
| 1992 | 4.24 | -24.89 % |
| 1993 | 5.86 | 38.42 % |
| 1994 | 9.65 | 64.57 % |
| 1995 | 7.05 | -26.96 % |
| 1996 | 10.82 | 53.55 % |
| 1997 | 13.58 | 25.49 % |
| 1998 | 13.92 | 2.50 % |
| 1999 | 16.61 | 19.29 % |
| 2000 | 19.54 | 17.66 % |
| 2001 | 17.47 | -10.61 % |
| 2002 | 17.01 | -2.59 % |
| 2003 | 16.25 | -4.49 % |
| 2004 | 18.66 | 14.84 % |
| 2005 | 21.45 | 14.92 % |
| 2006 | 23.10 | 7.70 % |
| 2007 | 25.55 | 10.63 % |
| 2008 | 33.72 | 31.97 % |
| 2009 | 26.79 | -20.54 % |
| 2010 | 25.75 | -3.90 % |
|
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