|
| year | consumption | change |
| 1980 | 62.00 | NA |
| 1981 | 22.95 | -62.98 % |
| 1982 | 24.00 | 4.58 % |
| 1983 | 18.00 | -25.00 % |
| 1984 | 20.00 | 11.11 % |
| 1985 | 23.00 | 15.00 % |
| 1986 | 27.00 | 17.39 % |
| 1987 | 35.43 | 31.22 % |
| 1988 | 88.29 | 149.20 % |
| 1989 | 88.29 | 0.00 % |
| 1990 | 77.00 | -12.79 % |
| 1991 | 39.00 | -49.35 % |
| 1992 | 101.00 | 158.97 % |
| 1993 | 90.05 | -10.84 % |
| 1994 | 111.94 | 24.30 % |
| 1995 | 111.95 | 0.01 % |
| 1996 | 114.42 | 2.21 % |
| 1997 | 107.71 | -5.86 % |
| 1998 | 104.18 | -3.28 % |
| 1999 | 112.30 | 7.80 % |
| 2000 | 111.24 | -0.94 % |
| 2001 | 97.47 | -12.38 % |
| 2002 | 83.34 | -14.49 % |
| 2003 | 38.85 | -53.39 % |
| 2004 | 61.80 | 59.09 % |
| 2005 | 51.21 | -17.14 % |
| 2006 | 63.57 | 24.14 % |
| 2007 | 51.56 | -18.89 % |
| 2008 | 66.39 | 28.77 % |
| 2009 | 40.58 | -38.88 % |
| 2010 | 45.91 | 13.14 % |
| 2011 | 31.08 | -32.31 % |
|
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