|
| year | consumption | change |
| 1984 | 83.42 | NA |
| 1985 | 78.59 | -5.78 % |
| 1986 | 80.64 | 2.60 % |
| 1987 | 78.87 | -2.19 % |
| 1988 | 77.46 | -1.79 % |
| 1989 | 79.10 | 2.12 % |
| 1990 | 79.76 | 0.82 % |
| 1991 | 80.01 | 0.32 % |
| 1992 | 82.91 | 3.62 % |
| 1993 | 87.72 | 5.80 % |
| 1994 | 90.47 | 3.14 % |
| 1995 | 93.13 | 2.94 % |
| 1996 | 94.15 | 1.09 % |
| 1997 | 93.56 | -0.63 % |
| 1998 | 94.57 | 1.08 % |
| 1999 | 95.85 | 1.35 % |
| 2000 | 93.07 | -2.90 % |
| 2001 | 95.40 | 2.50 % |
| 2002 | 96.52 | 1.17 % |
| 2003 | 96.89 | 0.38 % |
| 2004 | 95.99 | -0.92 % |
| 2005 | 94.85 | -1.19 % |
| 2006 | 97.16 | 2.44 % |
| 2007 | 96.88 | -0.29 % |
| 2008 | 99.60 | 2.80 % |
| 2009 | 96.65 | -2.96 % |
| 2010 | 96.56 | -0.09 % |
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