|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 46.05 | NA |
| 1987 | 48.16 | 4.57 % |
| 1988 | 49.45 | 2.67 % |
| 1989 | 50.67 | 2.47 % |
| 1990 | 49.90 | -1.52 % |
| 1991 | 44.44 | -10.95 % |
| 1992 | 39.71 | -10.65 % |
| 1993 | 38.79 | -2.31 % |
| 1994 | 40.02 | 3.18 % |
| 1995 | 36.39 | -9.08 % |
| 1996 | 36.02 | -1.00 % |
| 1997 | 34.31 | -4.75 % |
| 1998 | 33.57 | -2.16 % |
| 1999 | 34.65 | 3.24 % |
| 2000 | 34.75 | 0.29 % |
| 2001 | 33.35 | -4.04 % |
| 2002 | 26.74 | -19.82 % |
| 2003 | 31.93 | 19.42 % |
| 2004 | 25.63 | -19.76 % |
| 2005 | 25.29 | -1.32 % |
| 2006 | 29.95 | 18.45 % |
| 2007 | 34.82 | 16.26 % |
| 2008 | 32.98 | -5.29 % |
| 2009 | 26.00 | -21.17 % |
| 2010 | 26.43 | 1.65 % |
|
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