|
| year | consumption | change |
| 1984 | 34.45 | NA |
| 1985 | 35.42 | 2.82 % |
| 1986 | 35.38 | -0.13 % |
| 1987 | 35.42 | 0.12 % |
| 1988 | 35.78 | 1.02 % |
| 1989 | 35.30 | -1.33 % |
| 1990 | 37.16 | 5.25 % |
| 1991 | 39.38 | 5.99 % |
| 1992 | 41.31 | 4.89 % |
| 1993 | 42.34 | 2.51 % |
| 1994 | 43.85 | 3.57 % |
| 1995 | 44.29 | 1.00 % |
| 1996 | 44.54 | 0.55 % |
| 1997 | 45.72 | 2.67 % |
| 1998 | 47.02 | 2.83 % |
| 1999 | 46.67 | -0.75 % |
| 2000 | 45.81 | -1.84 % |
| 2001 | 44.87 | -2.05 % |
| 2002 | 45.21 | 0.76 % |
| 2003 | 45.21 | -0.01 % |
| 2004 | 44.68 | -1.18 % |
| 2005 | 43.43 | -2.79 % |
| 2006 | 42.76 | -1.55 % |
| 2007 | 42.62 | -0.33 % |
| 2008 | 40.52 | -4.93 % |
| 2009 | 38.17 | -5.78 % |
| 2010 | 36.51 | -4.35 % |
|
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