|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 9.20 | NA |
| 1987 | 9.70 | 5.46 % |
| 1988 | 11.36 | 17.16 % |
| 1989 | 12.80 | 12.69 % |
| 1990 | 11.57 | -9.65 % |
| 1991 | 12.52 | 8.20 % |
| 1992 | 14.26 | 13.90 % |
| 1993 | 15.43 | 8.21 % |
| 1994 | 15.96 | 3.49 % |
| 1995 | 15.48 | -3.04 % |
| 1996 | 15.39 | -0.59 % |
| 1997 | 16.64 | 8.13 % |
| 1998 | 17.93 | 7.73 % |
| 1999 | 18.96 | 5.78 % |
| 2000 | 18.42 | -2.88 % |
| 2001 | 20.18 | 9.56 % |
| 2002 | 20.18 | 0.01 % |
| 2003 | 18.80 | -6.85 % |
| 2004 | 18.56 | -1.25 % |
| 2005 | 20.71 | 11.58 % |
| 2006 | 25.62 | 23.70 % |
| 2007 | 25.78 | 0.64 % |
| 2008 | 27.06 | 4.95 % |
| 2009 | 24.82 | -8.29 % |
| 2010 | 22.83 | -8.01 % |
|
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