|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 40.36 | NA |
| 1987 | 49.64 | 23.00 % |
| 1988 | 45.95 | -7.43 % |
| 1989 | 37.65 | -18.06 % |
| 1990 | 45.67 | 21.31 % |
| 1991 | 56.09 | 22.80 % |
| 1992 | 52.87 | -5.73 % |
| 1993 | 50.98 | -3.58 % |
| 1994 | 52.08 | 2.17 % |
| 1995 | 50.50 | -3.04 % |
| 1996 | 51.66 | 2.30 % |
| 1997 | 53.50 | 3.56 % |
| 1998 | 54.50 | 1.87 % |
| 1999 | 28.77 | -47.22 % |
| 2000 | 62.95 | 118.84 % |
| 2001 | 72.14 | 14.59 % |
| 2002 | 69.20 | -4.08 % |
| 2003 | 83.00 | 19.95 % |
| 2004 | 79.56 | -4.15 % |
| 2005 | 77.41 | -2.71 % |
| 2006 | 66.73 | -13.79 % |
| 2007 | 53.48 | -19.85 % |
| 2008 | 47.59 | -11.01 % |
| 2009 | 61.84 | 29.95 % |
| 2010 | 48.00 | -22.38 % |
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