|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 12.34 | NA |
| 1987 | 13.85 | 12.23 % |
| 1988 | 15.84 | 14.33 % |
| 1989 | 13.02 | -17.76 % |
| 1990 | 15.64 | 20.07 % |
| 1991 | 16.41 | 4.96 % |
| 1992 | 23.60 | 43.78 % |
| 1993 | 16.62 | -29.57 % |
| 1994 | 20.31 | 22.21 % |
| 1995 | 25.87 | 27.35 % |
| 1996 | 25.84 | -0.12 % |
| 1997 | 27.45 | 6.24 % |
| 1998 | 28.23 | 2.83 % |
| 1999 | 22.75 | -19.41 % |
| 2000 | 24.81 | 9.05 % |
| 2001 | 27.49 | 10.82 % |
| 2002 | 38.01 | 38.25 % |
| 2003 | 32.38 | -14.80 % |
| 2004 | 30.14 | -6.92 % |
| 2005 | 28.61 | -5.05 % |
| 2006 | 29.57 | 3.35 % |
| 2007 | 34.12 | 15.37 % |
| 2008 | 31.58 | -7.43 % |
| 2009 | 28.38 | -10.16 % |
| 2010 | 28.44 | 0.22 % |
|
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