|
| year | consumption | change |
| 1984 | 116.57 | NA |
| 1985 | 121.29 | 4.05 % |
| 1986 | 116.19 | -4.20 % |
| 1987 | 123.94 | 6.67 % |
| 1988 | 109.66 | -11.52 % |
| 1989 | 118.63 | 8.18 % |
| 1990 | 119.78 | 0.97 % |
| 1991 | 114.93 | -4.05 % |
| 1992 | 129.26 | 12.47 % |
| 1993 | 137.91 | 6.69 % |
| 1994 | 129.82 | -5.86 % |
| 1995 | 144.38 | 11.21 % |
| 1996 | 151.22 | 4.74 % |
| 1997 | 149.20 | -1.34 % |
| 1998 | 144.42 | -3.20 % |
| 1999 | 137.84 | -4.56 % |
| 2000 | 141.51 | 2.66 % |
| 2001 | 135.50 | -4.24 % |
| 2002 | 146.96 | 8.46 % |
| 2003 | 144.19 | -1.88 % |
| 2004 | 131.33 | -8.92 % |
| 2005 | 117.76 | -10.34 % |
| 2006 | 100.29 | -14.83 % |
| 2007 | 77.10 | -23.12 % |
| 2008 | 64.54 | -16.29 % |
| 2009 | 44.85 | -30.51 % |
| 2010 | 17.79 | -60.33 % |
|
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