|
| year | consumption | change |
| 1984 | 33.64 | NA |
| 1985 | 35.21 | 4.66 % |
| 1986 | 38.15 | 8.36 % |
| 1987 | 40.19 | 5.35 % |
| 1988 | 41.97 | 4.42 % |
| 1989 | 44.96 | 7.11 % |
| 1990 | 45.98 | 2.26 % |
| 1991 | 45.93 | -0.11 % |
| 1992 | 46.01 | 0.19 % |
| 1993 | 43.43 | -5.61 % |
| 1994 | 44.41 | 2.25 % |
| 1995 | 43.92 | -1.11 % |
| 1996 | 42.34 | -3.58 % |
| 1997 | 43.55 | 2.84 % |
| 1998 | 43.01 | -1.23 % |
| 1999 | 42.81 | -0.48 % |
| 2000 | 41.21 | -3.73 % |
| 2001 | 41.88 | 1.61 % |
| 2002 | 42.62 | 1.78 % |
| 2003 | 42.76 | 0.32 % |
| 2004 | 43.52 | 1.78 % |
| 2005 | 43.43 | -0.21 % |
| 2006 | 43.11 | -0.74 % |
| 2007 | 43.04 | -0.15 % |
| 2008 | 40.69 | -5.47 % |
| 2009 | 39.77 | -2.25 % |
| 2010 | 38.83 | -2.38 % |
|
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