|
| year | consumption | change |
| 1980 | 16.04 | NA |
| 1981 | 15.83 | -1.31 % |
| 1982 | 15.63 | -1.26 % |
| 1983 | 15.38 | -1.60 % |
| 1984 | 15.91 | 3.45 % |
| 1985 | 16.06 | 0.97 % |
| 1986 | 15.96 | -0.66 % |
| 1987 | 18.78 | 17.69 % |
| 1988 | 18.95 | 0.87 % |
| 1989 | 19.47 | 2.75 % |
| 1990 | 20.35 | 4.53 % |
| 1991 | 21.16 | 3.97 % |
| 1992 | 21.36 | 0.96 % |
| 1993 | 20.47 | -4.14 % |
| 1994 | 20.76 | 1.39 % |
| 1995 | 21.07 | 1.51 % |
| 1996 | 20.06 | -4.82 % |
| 1997 | 19.67 | -1.94 % |
| 1998 | 22.21 | 12.91 % |
| 1999 | 22.36 | 0.71 % |
| 2000 | 23.29 | 4.13 % |
| 2001 | 23.98 | 2.98 % |
| 2002 | 23.92 | -0.26 % |
| 2003 | 25.95 | 8.49 % |
| 2004 | 29.09 | 12.11 % |
| 2005 | 30.52 | 4.90 % |
| 2006 | 39.15 | 28.29 % |
| 2007 | 43.22 | 10.40 % |
| 2008 | 42.80 | -0.98 % |
| 2009 | 46.00 | 7.48 % |
| 2010 | 49.92 | 8.53 % |
| 2011 | 45.00 | -9.86 % |
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