|
| year | consumption | change |
| 1984 | 34.51 | NA |
| 1985 | 36.83 | 6.72 % |
| 1986 | 39.36 | 6.86 % |
| 1987 | 40.70 | 3.40 % |
| 1988 | 41.05 | 0.87 % |
| 1989 | 41.28 | 0.57 % |
| 1990 | 41.39 | 0.26 % |
| 1991 | 40.05 | -3.23 % |
| 1992 | 39.11 | -2.36 % |
| 1993 | 38.92 | -0.48 % |
| 1994 | 39.03 | 0.29 % |
| 1995 | 38.59 | -1.12 % |
| 1996 | 39.04 | 1.16 % |
| 1997 | 38.57 | -1.21 % |
| 1998 | 38.96 | 1.02 % |
| 1999 | 38.69 | -0.71 % |
| 2000 | 37.40 | -3.34 % |
| 2001 | 38.92 | 4.06 % |
| 2002 | 38.53 | -1.00 % |
| 2003 | 38.15 | -0.97 % |
| 2004 | 37.82 | -0.87 % |
| 2005 | 36.58 | -3.28 % |
| 2006 | 35.19 | -3.80 % |
| 2007 | 33.36 | -5.20 % |
| 2008 | 31.21 | -6.43 % |
| 2009 | 29.41 | -5.78 % |
| 2010 | 27.92 | -5.06 % |
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