|
| year | consumption | change |
| 1980 | 78.00 | NA |
| 1981 | 77.00 | -1.28 % |
| 1982 | 73.50 | -4.55 % |
| 1983 | 75.50 | 2.72 % |
| 1984 | 74.50 | -1.32 % |
| 1985 | 64.82 | -12.99 % |
| 1986 | 66.50 | 2.59 % |
| 1987 | 69.81 | 4.97 % |
| 1988 | 67.67 | -3.07 % |
| 1989 | 66.06 | -2.37 % |
| 1990 | 70.34 | 6.47 % |
| 1991 | 70.28 | -0.08 % |
| 1992 | 72.28 | 2.85 % |
| 1993 | 70.90 | -1.92 % |
| 1994 | 81.32 | 14.71 % |
| 1995 | 85.92 | 5.65 % |
| 1996 | 72.28 | -15.88 % |
| 1997 | 76.56 | 5.92 % |
| 1998 | 84.66 | 10.58 % |
| 1999 | 78.40 | -7.39 % |
| 2000 | 77.38 | -1.30 % |
| 2001 | 80.28 | 3.75 % |
| 2002 | 76.59 | -4.60 % |
| 2003 | 77.57 | 1.27 % |
| 2004 | 88.03 | 13.48 % |
| 2005 | 84.30 | -4.23 % |
| 2006 | 86.35 | 2.43 % |
| 2007 | 89.49 | 3.63 % |
| 2008 | 52.01 | -41.88 % |
| 2009 | 97.67 | 87.79 % |
| 2010 | 108.59 | 11.18 % |
| 2011 | 99.00 | -8.83 % |
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