|
| year | consumption | change |
| 1980 | 4.80 | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | 5.60 | NA |
| 1985 | 6.40 | 14.29 % |
| 1986 | 5.49 | -14.15 % |
| 1987 | 6.19 | 12.72 % |
| 1988 | 6.29 | 1.51 % |
| 1989 | 6.84 | 8.77 % |
| 1990 | 7.39 | 8.10 % |
| 1991 | 10.49 | 41.93 % |
| 1992 | 7.14 | -31.90 % |
| 1993 | 9.22 | 29.09 % |
| 1994 | 10.58 | 14.71 % |
| 1995 | 10.86 | 2.69 % |
| 1996 | 12.63 | 16.25 % |
| 1997 | 12.51 | -0.92 % |
| 1998 | 12.26 | -2.01 % |
| 1999 | 12.00 | -2.15 % |
| 2000 | 12.05 | 0.40 % |
| 2001 | 11.59 | -3.78 % |
| 2002 | 11.47 | -1.06 % |
| 2003 | 12.94 | 12.81 % |
| 2004 | 12.95 | 0.11 % |
| 2005 | 14.03 | 8.29 % |
| 2006 | 14.09 | 0.46 % |
| 2007 | 14.67 | 4.14 % |
| 2008 | 16.34 | 11.36 % |
| 2009 | 15.47 | -5.35 % |
| 2010 | 16.28 | 5.28 % |
| 2011 | 17.00 | 4.40 % |
|
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