|
| year | consumption | change |
| 1984 | 16.74 | NA |
| 1985 | 17.01 | 1.62 % |
| 1986 | 17.76 | 4.45 % |
| 1987 | 19.24 | 8.30 % |
| 1988 | 21.37 | 11.10 % |
| 1989 | 22.22 | 3.95 % |
| 1990 | 24.89 | 12.03 % |
| 1991 | 26.42 | 6.15 % |
| 1992 | 28.27 | 7.00 % |
| 1993 | 30.39 | 7.48 % |
| 1994 | 32.64 | 7.42 % |
| 1995 | 34.17 | 4.67 % |
| 1996 | 37.18 | 8.82 % |
| 1997 | 36.96 | -0.58 % |
| 1998 | 34.68 | -6.19 % |
| 1999 | 34.77 | 0.28 % |
| 2000 | 33.00 | -5.11 % |
| 2001 | 32.51 | -1.47 % |
| 2002 | 32.38 | -0.40 % |
| 2003 | 29.87 | -7.76 % |
| 2004 | 29.76 | -0.36 % |
| 2005 | 28.15 | -5.41 % |
| 2006 | 27.33 | -2.94 % |
| 2007 | 27.97 | 2.36 % |
| 2008 | 27.35 | -2.21 % |
| 2009 | 23.45 | -14.25 % |
| 2010 | 23.39 | -0.28 % |
|
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