|
| year | consumption | change |
| 1980 | 200.00 | NA |
| 1981 | 219.00 | 9.50 % |
| 1982 | 158.80 | -27.49 % |
| 1983 | 152.00 | -4.28 % |
| 1984 | 167.00 | 9.87 % |
| 1985 | 144.58 | -13.42 % |
| 1986 | 155.52 | 7.57 % |
| 1987 | 161.79 | 4.03 % |
| 1988 | 147.46 | -8.86 % |
| 1989 | 143.07 | -2.97 % |
| 1990 | 140.16 | -2.04 % |
| 1991 | 175.61 | 25.29 % |
| 1992 | 155.58 | -11.40 % |
| 1993 | 162.16 | 4.23 % |
| 1994 | 165.37 | 1.98 % |
| 1995 | 169.07 | 2.24 % |
| 1996 | 174.87 | 3.43 % |
| 1997 | 179.25 | 2.51 % |
| 1998 | 183.54 | 2.40 % |
| 1999 | 153.62 | -16.30 % |
| 2000 | 201.35 | 31.08 % |
| 2001 | 213.86 | 6.21 % |
| 2002 | 212.08 | -0.84 % |
| 2003 | 217.81 | 2.70 % |
| 2004 | 222.76 | 2.27 % |
| 2005 | 215.21 | -3.39 % |
| 2006 | 210.73 | -2.08 % |
| 2007 | 169.65 | -19.49 % |
| 2008 | 175.24 | 3.30 % |
| 2009 | 155.62 | -11.20 % |
| 2010 | 176.00 | 13.10 % |
| 2011 | 152.00 | -13.64 % |
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