|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | | NA |
| 1993 | 10.93 | NA |
| 1994 | 11.48 | 5.04 % |
| 1995 | 12.38 | 7.85 % |
| 1996 | 11.20 | -9.52 % |
| 1997 | 14.91 | 33.10 % |
| 1998 | 15.44 | 3.56 % |
| 1999 | 14.89 | -3.58 % |
| 2000 | 13.90 | -6.64 % |
| 2001 | 14.17 | 1.95 % |
| 2002 | 16.81 | 18.62 % |
| 2003 | 15.47 | -7.99 % |
| 2004 | 14.17 | -8.35 % |
| 2005 | 14.88 | 5.01 % |
| 2006 | 14.04 | -5.71 % |
| 2007 | 14.70 | 4.76 % |
| 2008 | 15.54 | 5.67 % |
| 2009 | 14.61 | -5.99 % |
| 2010 | 14.49 | -0.81 % |
|
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