|
| year | consumption | change |
| 1980 | 160.70 | NA |
| 1981 | 163.70 | 1.87 % |
| 1982 | 167.60 | 2.38 % |
| 1983 | 171.80 | 2.51 % |
| 1984 | 174.00 | 1.28 % |
| 1985 | 171.47 | -1.45 % |
| 1986 | 171.82 | 0.20 % |
| 1987 | 184.57 | 7.42 % |
| 1988 | 198.44 | 7.51 % |
| 1989 | 208.53 | 5.08 % |
| 1990 | 196.91 | -5.58 % |
| 1991 | 204.88 | 4.05 % |
| 1992 | 229.53 | 12.03 % |
| 1993 | 240.22 | 4.66 % |
| 1994 | 244.41 | 1.74 % |
| 1995 | 250.63 | 2.55 % |
| 1996 | 278.13 | 10.97 % |
| 1997 | 286.51 | 3.01 % |
| 1998 | 289.02 | 0.87 % |
| 1999 | 277.40 | -4.02 % |
| 2000 | 277.49 | 0.03 % |
| 2001 | 271.18 | -2.27 % |
| 2002 | 261.20 | -3.68 % |
| 2003 | 265.36 | 1.59 % |
| 2004 | 267.52 | 0.81 % |
| 2005 | 270.71 | 1.19 % |
| 2006 | 274.16 | 1.28 % |
| 2007 | 279.89 | 2.09 % |
| 2008 | 259.78 | -7.19 % |
| 2009 | 257.50 | -0.88 % |
| 2010 | 267.45 | 3.87 % |
| 2011 | 298.00 | 11.42 % |
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