|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 96.85 | NA |
| 1987 | 99.19 | 2.42 % |
| 1988 | 87.52 | -11.76 % |
| 1989 | 68.07 | -22.22 % |
| 1990 | 62.81 | -7.73 % |
| 1991 | 64.50 | 2.68 % |
| 1992 | 49.40 | -23.41 % |
| 1993 | 53.77 | 8.84 % |
| 1994 | 43.18 | -19.68 % |
| 1995 | 35.84 | -17.01 % |
| 1996 | 38.93 | 8.63 % |
| 1997 | 50.75 | 30.35 % |
| 1998 | 48.51 | -4.41 % |
| 1999 | 43.78 | -9.76 % |
| 2000 | 37.10 | -15.26 % |
| 2001 | 32.03 | -13.65 % |
| 2002 | 23.15 | -27.73 % |
| 2003 | 30.03 | 29.72 % |
| 2004 | 33.16 | 10.44 % |
| 2005 | 46.68 | 40.75 % |
| 2006 | 49.13 | 5.25 % |
| 2007 | 61.69 | 25.57 % |
| 2008 | 74.72 | 21.12 % |
| 2009 | 59.74 | -20.04 % |
| 2010 | 61.54 | 3.01 % |
|
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