|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 19.48 | NA |
| 1987 | 24.20 | 24.23 % |
| 1988 | 35.06 | 44.88 % |
| 1989 | 34.38 | -1.93 % |
| 1990 | 35.26 | 2.55 % |
| 1991 | 37.55 | 6.50 % |
| 1992 | 30.43 | -18.96 % |
| 1993 | 28.86 | -5.15 % |
| 1994 | 27.65 | -4.22 % |
| 1995 | 29.48 | 6.65 % |
| 1996 | 13.94 | -52.73 % |
| 1997 | 33.36 | 139.32 % |
| 1998 | 21.30 | -36.14 % |
| 1999 | 31.73 | 48.95 % |
| 2000 | 33.48 | 5.51 % |
| 2001 | 31.24 | -6.69 % |
| 2002 | 27.11 | -13.21 % |
| 2003 | 39.73 | 46.53 % |
| 2004 | 16.41 | -58.69 % |
| 2005 | 23.96 | 45.97 % |
| 2006 | 22.25 | -7.16 % |
| 2007 | 19.34 | -13.06 % |
| 2008 | 15.84 | -18.11 % |
| 2009 | 19.84 | 25.28 % |
| 2010 | 25.90 | 30.53 % |
|
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