|
| year | consumption | change |
| 1984 | 59.84 | NA |
| 1985 | 57.93 | -3.20 % |
| 1986 | 62.97 | 8.70 % |
| 1987 | 65.68 | 4.31 % |
| 1988 | 67.74 | 3.13 % |
| 1989 | 66.60 | -1.68 % |
| 1990 | 63.13 | -5.21 % |
| 1991 | 63.38 | 0.40 % |
| 1992 | 67.03 | 5.75 % |
| 1993 | 65.72 | -1.95 % |
| 1994 | 65.73 | 0.01 % |
| 1995 | 65.59 | -0.22 % |
| 1996 | 63.24 | -3.58 % |
| 1997 | 58.69 | -7.19 % |
| 1998 | 58.16 | -0.91 % |
| 1999 | 55.43 | -4.69 % |
| 2000 | 51.83 | -6.49 % |
| 2001 | 50.61 | -2.36 % |
| 2002 | 48.32 | -4.53 % |
| 2003 | 48.73 | 0.86 % |
| 2004 | 44.61 | -8.47 % |
| 2005 | 40.79 | -8.56 % |
| 2006 | 33.92 | -16.85 % |
| 2007 | 32.27 | -4.86 % |
| 2008 | 33.66 | 4.32 % |
| 2009 | 32.87 | -2.36 % |
| 2010 | 39.40 | 19.88 % |
|
|