|
| year | consumption | change |
| 1980 | 4.20 | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 3.43 | NA |
| 1987 | 4.69 | 36.85 % |
| 1988 | 6.15 | 30.96 % |
| 1989 | 7.17 | 16.63 % |
| 1990 | 6.25 | -12.85 % |
| 1991 | 6.60 | 5.63 % |
| 1992 | 21.95 | 232.51 % |
| 1993 | 22.58 | 2.88 % |
| 1994 | 22.51 | -0.31 % |
| 1995 | 22.81 | 1.34 % |
| 1996 | 22.95 | 0.62 % |
| 1997 | 23.15 | 0.84 % |
| 1998 | 23.25 | 0.45 % |
| 1999 | 23.25 | 0.00 % |
| 2000 | 23.76 | 2.19 % |
| 2001 | 23.74 | -0.11 % |
| 2002 | 22.75 | -4.18 % |
| 2003 | 23.30 | 2.44 % |
| 2004 | 19.96 | -14.34 % |
| 2005 | 23.52 | 17.84 % |
| 2006 | 20.61 | -12.35 % |
| 2007 | 18.70 | -9.27 % |
| 2008 | 12.88 | -31.13 % |
| 2009 | 12.81 | -0.59 % |
| 2010 | 12.81 | 0.00 % |
| 2011 | 21.00 | 64.00 % |
|
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