|
| year | consumption | change |
| 1980 | 9.18 | NA |
| 1981 | 8.83 | -3.81 % |
| 1982 | 10.00 | 13.25 % |
| 1983 | 12.40 | 24.00 % |
| 1984 | 12.00 | -3.23 % |
| 1985 | 13.00 | 8.33 % |
| 1986 | 14.00 | 7.69 % |
| 1987 | 15.90 | 13.57 % |
| 1988 | 17.66 | 11.07 % |
| 1989 | 15.19 | -13.99 % |
| 1990 | 19.00 | 25.08 % |
| 1991 | 20.00 | 5.26 % |
| 1992 | 20.13 | 0.65 % |
| 1993 | 19.78 | -1.75 % |
| 1994 | 18.36 | -7.16 % |
| 1995 | 19.77 | 7.68 % |
| 1996 | 19.78 | 0.03 % |
| 1997 | 20.13 | 1.79 % |
| 1998 | 20.48 | 1.75 % |
| 1999 | 19.78 | -3.45 % |
| 2000 | 20.13 | 1.79 % |
| 2001 | 18.72 | -7.02 % |
| 2002 | 21.90 | 16.98 % |
| 2003 | 22.95 | 4.84 % |
| 2004 | 26.49 | 15.38 % |
| 2005 | 22.95 | -13.33 % |
| 2006 | 24.01 | 4.62 % |
| 2007 | 29.31 | 22.06 % |
| 2008 | 24.01 | -18.07 % |
| 2009 | 24.37 | 1.47 % |
| 2010 | 25.89 | 6.23 % |
| 2011 | 26.56 | 2.59 % |
|
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