|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 3.04 | NA |
| 1987 | 2.99 | -1.54 % |
| 1988 | 3.05 | 2.06 % |
| 1989 | 3.04 | -0.49 % |
| 1990 | 2.80 | -7.69 % |
| 1991 | 2.55 | -9.10 % |
| 1992 | 2.63 | 3.31 % |
| 1993 | 2.73 | 3.58 % |
| 1994 | 2.90 | 6.23 % |
| 1995 | 2.33 | -19.54 % |
| 1996 | 2.83 | 21.30 % |
| 1997 | 2.55 | -10.01 % |
| 1998 | 3.11 | 22.13 % |
| 1999 | 3.44 | 10.53 % |
| 2000 | 3.62 | 5.23 % |
| 2001 | 3.84 | 6.28 % |
| 2002 | 4.07 | 5.84 % |
| 2003 | 3.88 | -4.60 % |
| 2004 | 4.24 | 9.34 % |
| 2005 | 4.53 | 6.89 % |
| 2006 | 4.40 | -2.92 % |
| 2007 | 4.65 | 5.66 % |
| 2008 | 4.63 | -0.50 % |
| 2009 | 5.19 | 12.12 % |
| 2010 | 5.45 | 4.95 % |
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