|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 25.00 | NA |
| 1987 | 25.70 | 2.80 % |
| 1988 | 27.80 | 8.17 % |
| 1989 | 33.60 | 20.86 % |
| 1990 | 34.00 | 1.19 % |
| 1991 | 38.05 | 11.93 % |
| 1992 | 35.19 | -7.52 % |
| 1993 | 30.24 | -14.07 % |
| 1994 | 34.59 | 14.37 % |
| 1995 | 37.39 | 8.11 % |
| 1996 | 39.30 | 5.10 % |
| 1997 | 38.80 | -1.27 % |
| 1998 | 38.70 | -0.26 % |
| 1999 | 43.80 | 13.16 % |
| 2000 | 44.68 | 2.02 % |
| 2001 | 46.93 | 5.03 % |
| 2002 | 44.43 | -5.33 % |
| 2003 | 43.37 | -2.37 % |
| 2004 | 43.68 | 0.69 % |
| 2005 | 44.43 | 1.72 % |
| 2006 | 27.23 | -38.72 % |
| 2007 | 28.51 | 4.72 % |
| 2008 | 28.30 | -0.74 % |
| 2009 | 30.22 | 6.77 % |
| 2010 | 28.30 | -6.34 % |
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