|
| year | consumption | change |
| 1980 | | NA |
| 1981 | 5.40 | NA |
| 1982 | 5.20 | -3.70 % |
| 1983 | 5.70 | 9.62 % |
| 1984 | 5.70 | 0.00 % |
| 1985 | 5.80 | 1.75 % |
| 1986 | 7.17 | 23.64 % |
| 1987 | 6.20 | -13.54 % |
| 1988 | 9.15 | 47.52 % |
| 1989 | 10.35 | 13.11 % |
| 1990 | 11.91 | 15.17 % |
| 1991 | 12.11 | 1.64 % |
| 1992 | 14.44 | 19.26 % |
| 1993 | 14.51 | 0.49 % |
| 1994 | 14.65 | 0.96 % |
| 1995 | 15.62 | 6.59 % |
| 1996 | 15.95 | 2.15 % |
| 1997 | 16.20 | 1.56 % |
| 1998 | 16.35 | 0.89 % |
| 1999 | 16.35 | 0.00 % |
| 2000 | 19.88 | 21.61 % |
| 2001 | 21.75 | 9.39 % |
| 2002 | 19.79 | -9.01 % |
| 2003 | 20.55 | 3.85 % |
| 2004 | 21.38 | 4.03 % |
| 2005 | 21.89 | 2.40 % |
| 2006 | 22.20 | 1.41 % |
| 2007 | 23.02 | 3.70 % |
| 2008 | 22.77 | -1.11 % |
| 2009 | 20.62 | -9.41 % |
| 2010 | 21.00 | 1.83 % |
| 2011 | 24.00 | 14.27 % |
|
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