|
| year | consumption | change |
| 1980 | 244.00 | NA |
| 1981 | 236.00 | -3.28 % |
| 1982 | 223.00 | -5.51 % |
| 1983 | 222.60 | -0.18 % |
| 1984 | 200.00 | -10.15 % |
| 1985 | 206.00 | 3.00 % |
| 1986 | 195.00 | -5.34 % |
| 1987 | 199.00 | 2.05 % |
| 1988 | 182.00 | -8.54 % |
| 1989 | 183.00 | 0.55 % |
| 1990 | 178.00 | -2.73 % |
| 1991 | 164.00 | -7.87 % |
| 1992 | 164.00 | 0.00 % |
| 1993 | 161.00 | -1.83 % |
| 1994 | 162.00 | 0.62 % |
| 1995 | 155.00 | -4.32 % |
| 1996 | 145.00 | -6.45 % |
| 1997 | 149.00 | 2.76 % |
| 1998 | 156.00 | 4.70 % |
| 1999 | 149.00 | -4.49 % |
| 2000 | 143.25 | -3.86 % |
| 2001 | 138.16 | -3.55 % |
| 2002 | 140.39 | 1.62 % |
| 2003 | 136.42 | -2.83 % |
| 2004 | 136.20 | -0.17 % |
| 2005 | 154.76 | 13.63 % |
| 2006 | 163.15 | 5.42 % |
| 2007 | 160.92 | -1.37 % |
| 2008 | 158.83 | -1.30 % |
| 2009 | 158.22 | -0.38 % |
| 2010 | 149.28 | -5.65 % |
| 2011 | 141.15 | -5.45 % |
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