|
| year | consumption | change |
| 1980 | 3.30 | NA |
| 1981 | 3.70 | 12.12 % |
| 1982 | 3.30 | -10.81 % |
| 1983 | 2.60 | -21.21 % |
| 1984 | 2.40 | -7.69 % |
| 1985 | 5.50 | 129.17 % |
| 1986 | 8.23 | 49.67 % |
| 1987 | 8.40 | 1.99 % |
| 1988 | 10.84 | 29.15 % |
| 1989 | 9.33 | -13.92 % |
| 1990 | 9.69 | 3.81 % |
| 1991 | 9.98 | 3.05 % |
| 1992 | 17.64 | 76.72 % |
| 1993 | 18.35 | 4.00 % |
| 1994 | 18.45 | 0.56 % |
| 1995 | 18.49 | 0.22 % |
| 1996 | 18.52 | 0.15 % |
| 1997 | 18.50 | -0.13 % |
| 1998 | 21.45 | 15.98 % |
| 1999 | 18.59 | -13.33 % |
| 2000 | 41.09 | 121.02 % |
| 2001 | 22.68 | -44.81 % |
| 2002 | 23.07 | 1.72 % |
| 2003 | 23.67 | 2.60 % |
| 2004 | 24.35 | 2.89 % |
| 2005 | 25.05 | 2.84 % |
| 2006 | 25.61 | 2.27 % |
| 2007 | 26.40 | 3.08 % |
| 2008 | 27.00 | 2.27 % |
| 2009 | 27.79 | 2.92 % |
| 2010 | 28.23 | 1.60 % |
| 2011 | 18.00 | -36.25 % |
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