|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 16.69 | NA |
| 1987 | 15.86 | -4.99 % |
| 1988 | 17.54 | 10.59 % |
| 1989 | 21.92 | 24.98 % |
| 1990 | 24.18 | 10.32 % |
| 1991 | 24.89 | 2.92 % |
| 1992 | 24.22 | -2.66 % |
| 1993 | 29.10 | 20.14 % |
| 1994 | 34.20 | 17.52 % |
| 1995 | 43.03 | 25.82 % |
| 1996 | 40.17 | -6.66 % |
| 1997 | 39.99 | -0.44 % |
| 1998 | 37.70 | -5.73 % |
| 1999 | 35.34 | -6.25 % |
| 2000 | 34.60 | -2.11 % |
| 2001 | 33.03 | -4.52 % |
| 2002 | 27.52 | -16.68 % |
| 2003 | 31.87 | 15.79 % |
| 2004 | 34.78 | 9.12 % |
| 2005 | 35.13 | 1.00 % |
| 2006 | 39.22 | 11.65 % |
| 2007 | 40.25 | 2.64 % |
| 2008 | 50.49 | 25.43 % |
| 2009 | 44.38 | -12.09 % |
| 2010 | 35.57 | -19.87 % |
|
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