|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 1.67 | NA |
| 1987 | 1.55 | -6.79 % |
| 1988 | 1.20 | -22.61 % |
| 1989 | 1.32 | 9.48 % |
| 1990 | 1.39 | 5.80 % |
| 1991 | 1.40 | 0.44 % |
| 1992 | 1.48 | 5.98 % |
| 1993 | 1.61 | 8.25 % |
| 1994 | 2.62 | 63.35 % |
| 1995 | 1.27 | -51.47 % |
| 1996 | 3.06 | 140.79 % |
| 1997 | 2.95 | -3.91 % |
| 1998 | 2.42 | -17.97 % |
| 1999 | 2.53 | 4.58 % |
| 2000 | 2.07 | -18.09 % |
| 2001 | 2.14 | 3.65 % |
| 2002 | 2.32 | 8.14 % |
| 2003 | 2.41 | 3.79 % |
| 2004 | 2.36 | -1.78 % |
| 2005 | 2.37 | 0.13 % |
| 2006 | 2.60 | 9.90 % |
| 2007 | 3.18 | 22.13 % |
| 2008 | 2.67 | -16.00 % |
| 2009 | 2.42 | -9.52 % |
| 2010 | 2.35 | -2.66 % |
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