|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 7.10 | NA |
| 1987 | 6.32 | -11.00 % |
| 1988 | 8.50 | 34.44 % |
| 1989 | 12.22 | 43.74 % |
| 1990 | 12.46 | 2.00 % |
| 1991 | 9.39 | -24.66 % |
| 1992 | 9.92 | 5.63 % |
| 1993 | 8.17 | -17.58 % |
| 1994 | 3.58 | -56.26 % |
| 1995 | 3.21 | -10.10 % |
| 1996 | 14.97 | 365.73 % |
| 1997 | 15.17 | 1.29 % |
| 1998 | 16.30 | 7.50 % |
| 1999 | 16.16 | -0.88 % |
| 2000 | 16.91 | 4.66 % |
| 2001 | 19.68 | 16.35 % |
| 2002 | 18.95 | -3.71 % |
| 2003 | 18.03 | -4.84 % |
| 2004 | 18.17 | 0.75 % |
| 2005 | 19.10 | 5.16 % |
| 2006 | 21.62 | 13.17 % |
| 2007 | 26.73 | 23.66 % |
| 2008 | 33.68 | 25.99 % |
| 2009 | 30.91 | -8.22 % |
| 2010 | 26.50 | -14.28 % |
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