|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 15.47 | NA |
| 1987 | 15.74 | 1.72 % |
| 1988 | 11.15 | -29.16 % |
| 1989 | 11.13 | -0.21 % |
| 1990 | 12.00 | 7.86 % |
| 1991 | 16.59 | 38.27 % |
| 1992 | 22.72 | 36.95 % |
| 1993 | 24.63 | 8.40 % |
| 1994 | 26.17 | 6.26 % |
| 1995 | 29.89 | 14.20 % |
| 1996 | 27.64 | -7.52 % |
| 1997 | 30.61 | 10.76 % |
| 1998 | 32.99 | 7.77 % |
| 1999 | 31.41 | -4.80 % |
| 2000 | 32.00 | 1.87 % |
| 2001 | 27.55 | -13.90 % |
| 2002 | 27.58 | 0.08 % |
| 2003 | 29.45 | 6.78 % |
| 2004 | 29.44 | -0.04 % |
| 2005 | 29.75 | 1.07 % |
| 2006 | 26.81 | -9.90 % |
| 2007 | 22.36 | -16.56 % |
| 2008 | 32.74 | 46.39 % |
| 2009 | 37.81 | 15.49 % |
| 2010 | 37.27 | -1.42 % |
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